Carbon-14 is an example of radioactive isotope in fossils.
What are radioactive isotopes?Radioactive isotopes can be used to date fossils, as well as rocks and other geologic materials. The technique is called radiometric dating, and it involves measuring the levels of isotopes in a sample. Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons in the nucleus. Some isotopes, known as radioactive isotopes, have unstable nuclei that emit particles and energy over time in a process called radioactive decay.
Radioactive isotopes such as Potassium-Argon and Uranium-Lead dating can also be used to date fossils and rocks.
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What is the most accepted evidence of evolution?
Answer:
fossil and DNA
Explanation:
Fossils are the most direct way that we can see the past history of life on Earth. Traditional study of evolution using fossils consists mostly of comparing the skeletons of fossil organisms to the skeletons of extant organisms.
DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are. Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.
Answer:
fossils and maybe DNA?
Explanation:
Which step in photosynthesis does not need light?
Answer: Dark Reaction
Explanation: Its the second stage of photosynthesis and it does not require light.
Which of the following terms best describes a lifestyle that promotes
gradual usage and replenishment of resources?
A Unsustainability
B Footprints
C Ecology
D Sustainability
D: Sustainability hope it helps
The best term that describes a lifestyle that promotes gradual usage and replenishment of resources is D : Sustainability
Sustainability in the general term is simply the ability to achieve a level of stability of resources over a very long period of time without depletion of natural resources. and to achieve this one has to ensure a consistent/gradual replenishment of used resources. while Unsustainability is the opposite of sustainability.
Other options do not comprehensively promote the gradual usage and replenishment of resources
Hence the term that best describes a lifestyle that promotes gradual usage and replenishment is Sustainability.
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Which of the following is a treatment option for endometriosis?
O A.
Pain relievers
O B.
Hormone therapy
O C. Surgery
OD.
All of the above
Answer:
A
Explanation:
Not sure if it's right but yea
Answer:
The Answer is D: All of the above
Explanation:
ASAP: Which of the following statements about scientific theory is false?
(1 Point)
Scientific theories are explanations of natural phenomena that do not change over time.
Scientific theories are explanations of the natural world based on strong scientific evidence.
Scientific laws that are widely accepted become scientific theories.
Answer:
im not sure im just telling because you are in hurry i think it is the first answer
why are the polio virus unable to reproduce if their DNA base sequence is different from the normal virus?
Answer:
When the virus infects a cell, the RNA genome enters the cell and programs it to make new virus particles. These virus particles are released from the cell and go on to infect new cells. In humans, poliovirus is ingested, and replicates in cells of the gastrointestinal tract.Poliovirus, the prototypical picornavirus and causative agent of poliomyelitis, is a nonenveloped virus with a single-stranded RNA genome of positive polarity. The virion consists of an icosahedral protein shell, composed of four capsid proteins (VP1, VP2, VP3, and VP4), which encapsidates the RNA genome (1).RNA viruses generally have very high mutation rates compared to DNA viruses, because viral RNA polymerases lack the proofreading ability of DNA polymerases. The genetic diversity of RNA viruses is one reason why it is difficult to make effective vaccines against them.
What happens to enzymes under high heat and how does this prevent them
from functioning properly?
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a plant without sent that makes a large amount of pollen is pollinated by
Answer: Wind
Explanation: Wind pollinated flowers are dry, light, have small or no petals, do not produce scent or nectar and pollen grains are produced in abundance.
They have these qualities, so that they can be easily flown away, and if any of them are wasted it won't affect as they produce pollen grains to supply their species.
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A forest has not experienced any severe weather changes for several years. The ecosystem supports a stable population of deer. What is the most likely reason for this stability?
Answer:
The most likely reason for this stability is that the forest has remained relatively unchanged for several years, which allows the deer population to stabilize
c. Challenge: You are working with a neuronal cell line isolated from a human brain tumor. It appears to have a neuronal phenotype when grown in culture on laminin coated dishes but appears to have more of a typical round, small (3 to 5 micrometer) phenotype when grown on a standard, collagen-only coated dish or a poly-lysine coated (positive charge only - no ECM component) dish. Under all 3 cases the cells attach to the substrate. You suspect that the reason the neuronal phenotype is supported by the laminin coating is due to the ability of laminin, but not collagen or poly-lysine, to bind to the integrin receptors RGD binding domain thus triggering a molecular cascade that leads to the expression of the neuronal phenotype. How might you test this hypothesis
Answer:
This process can be performed using immunofluorescence analysis via antibodies.
Explanation:
To test for the hypothesis
To test for the hypothesis we have to analyze whether the neuronal phenotype is due to the binding of laminin to integrins, and this will enable us to determine which integrins are abundantly expressed on the neuronal cell membrane. This process can be performed using immunofluorescence analysis via antibodies
Finally when no differentiation markers are expressed in the laminin coated plates with mutant cells we can now say that it expresses integrins
Soil generation and soil conservation are equally effective agricultural strategies.
Please select the best answer from the choices provided
OT
OF
Answer:
Your Answer is True. True
Kidneys are part if rhe excretory system in a human body.they purify the impure blood and sned it back to the rest of the body. Which system is mainly responsible for the transport of plasma to the kidneys?
Answer:
circulatory system
Explanation:
The circulatory system is mainly responsible for the transport of plasma to the kidneys
Answer:
Circulatory system
Explanation:
Which of the following is NOT a way in which humans increase biodiversity?
Introduction of invasive species
Building artificial reefs
Removal of pollutants
Restoration of local communities
Answer:
restoration of local communities
The image does not show orders of insects. Suggest three categories of insects that would likely
be grouped into orders
Three categories of insects that would likely be grouped into orders include:
Beetles (Coleoptera)Flies (Diptera)Wasps, bees, and ants (Hymenoptera)What are insects?Insects are a class of invertebrates within the arthropod phylum that have a chitinous exoskeleton, a three-part body (head, thorax, and abdomen), three pairs of jointed legs, compound eyes, and one pair of antennae.
There are over a million known species of insects, which are found in nearly every environment on Earth and play important roles in ecosystems as pollinators, decomposers, and food for other animals. Some examples of insects include ants, bees, beetles, butterflies, and flies.
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what is significant about anaphase
Answer:
It ensures that duplicated chromosomes, or sister chromatids, separate into two equal sets
Explanation:
How are sex cells different from other human cells?
Sex cells have half as many chromosomes
Sex cells have double chromosomes
Sex cells are larger.
Sex cells have no chromosomes.
Answer:
They have diffrent oxeans, which makes color trasnfers, differnt
Explanation:
Answer:
Students will explore the structure and function of cells - the building blocks of life. Using a simple factory analogy, they will discover how the major parts of a cell work together to make a product. Each student will build a 3-D cell model to help visualize the abstract world of the microscopic cell.
Students will:
discover that in nature “form fits function”;
understand that there is order to a living thing, and that cells give rise to tissues, tissues to organs, and organs to organ systems;
identify organelles and other cellular structures by their scientific names;
learn how organelles and other structures work together in a cell; and
build a macroscopic model of an animal cell.Examine the five kingdoms of life through a microscope! Slides of animal, plant, fungi, protist, and bacteria cells are magnified up to 400x in a compound microscope as part of an exploration of biodiversity and classification.
Students will:
view cells from all five kingdoms magnified through a compound microscope;
record microscope observations;
compare and contrast cell types; and
learn how to prepare a wet mount slide with cheek cells and use a compound microscope.Understanding the structure of DNA helps to explain its function. In this lab, students are introduced to the composition of DNA building blocks called nucleotides. They will discover how the subunits of the nucleotides - nitrogenous bases, phosphate groups and deoxyribose sugars - fit together to form the double helix. The lab concludes with the construction of 3-D models that show the famous structure.
Students will:
discuss the role of DNA in living things;
explore the structure and function of the DNA molecule;
learn about the base pairs of DNA and the importance of sequence; and
construct a model of DNA.Gregor Mendel is known as the “Father of Genetics.” His proposed principles of heredity—based on his own observations of heredity in garden plants—formed the basis of our understanding of classical genetics. In this lab, kernel color in corn is used to illustrate some of Mendel’s laws of inheritance.
Students will:
collect data from corn crosses to show patterns of heredity;
use Punnett squares to predict possible outcomes from genetic crosses; and
learn how Mendel’s laws can be applied today.
Explanation:
Pleeeeeasssssee heeelp asap The image is attached
The box lists some characteristics of a plant that has adapted to conditions in Its environment. Grows in clusters and low to the ground Able to grow under a layer of snow Carries out photosynthesis at temperatures below freezing Flowers very quickly and briefly during Summer Produces small, moisture-retaining leaves To which type of environment is the plant best adapted? A. Desert Grassland Rainforest D. (ID Tundra
No links i will report
Answer:tundra
Explanation:I’m doing the test rn lol
[tex]{\huge\pink{\fbox{{࿐Define Blood Pressure࿐}}}}[/tex]
Class 10 - NCERT Book - only references from this book, answers from the internet will be reported. No spam!!!
Answer:
[tex]{\boxed{\boxed{\tt { Blood / Pressure}}}} \ [/tex]
The force that blood exerts against the wall of a vessel is called blood pressure.
Class 10 - NCERT Book - definition.
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Answer:
The force that blood exerts against the wall of a vessel is called blood pressure.
Explanation:
What does parasitism mean?
Answer: It basically means when a parasite is living inside of another organism that causes harm to the host.
Explanation:
I hope this helps:)))
Answer: There is multiple definitions based of the dictionary but it generally mean "infestation by a parasite" or " the practice of living as a parasite in or on another organism".
Explanation:
Like going into or onto something, and taking over; Like how a parasite makes its way into already owned home, and taking over the host.
Hope this helps!
The nurse is aware that any description of health would
include the concept that:
A) health is the absence of illness, and illness is the presence
of chronic disease.
B) illness is a biological malfunction, and health is biological
soundness.
C) lifestyle factors are the major determinants of health or
illness.
D) culture, education, and socioeconomic status influence
one's definition of health or illness.
Answer: C
Explanation:
I believe that this is the answer because a nurse should only care about the patents health, socioeconomic or status should not be a deciding factor.
Question 18 of 25
When describing image formation for flat, shiny surfaces, what is an
important rule to remember about light rays?
Answer:
Some important rules of light are:
the incident ray,normal ray and the reflected ray lie in the same point.angle of incidence is equal to angle of reflection..The Angle When It Leaves Is Larger Than The Angle When It Hits. The Angle Is Smaller In The Medium That Has The Higher Index Of Refraction.
hope it is helpful to you
Which of these groups contains a single -celled organisms?
Answer:
Escherichia coli.
Diatoms.
Protozoa.
Protista.
Streptococcus.
Pneumococci.
Dinoflagellates.
Explanation:
Investiga como se reproducen las células madres
Answer:
Las células madre son células que se reproducen constantemente y tienen la capacidad de transformarse en cualquier otro tipo de célula del cuerpo de un organismo. Una célula a partir de la cual pueden crecer todos los tejidos del cuerpo, o una gran parte de ellos, es obviamente una célula extremadamente útil.
Si las células madre se guían en la formación de tejidos sanos y funcionales, entonces, potencialmente, la terapia celular podría aplicarse para muchas enfermedades. De hecho, si las células provienen del propio paciente, en teoría no habrá riesgo de su rechazo (como lamentablemente ocurre con los trasplantes).
Las células madre tienen la capacidad de reproducirse por sí mismas a través del proceso de mitosis celular, para crear copias idénticas (clones) de sí mismas..
On which date is the high temperature and rainfall least likely to occur in this
desert?
Answer:
i think January 5th
Explanation:
Which therapeutic cloning application is most likely a benefit to society?
A) production of a new line of mouse cells for research
B) creation of a new flower variety for gardens in dry climates
C) generation of nerve tissue for treating paralyzed patients
D) formation of a new liver to be transplanted into a child
An unusually cold winter causes the squirrel population to decrease. This is an example of temperature as a
A. Carrying capacity
B. Limiting factor
C. Climax community
D. Pattern in space
Please and answer thank you!
Answer:
Most likely B
Explanation:
A - Carrying capacity is the amount of a species that can live in a given area with the given resources, weather does not apply.
B - Limiting factors are things such as food, mates, and competition with other organisms for resources, which can limit the maximum population. Temperature can be applied here, it is the best option.
C - Climax community is when an area's ecosystem is stable, so the term makes no sense used here.
D - To be honest I have no clue what this is. But making an assumption from the term, the winter being "unusually cold" does not make it a "pattern". So I don't think it's this option. I could be wrong, but I assume this is not the right choice.
Lisa has a glass that has a mass of exactly 100 grams. She puts exactly 45 grams of acid in the glass, and then she adds 15 grams of crushed limestone. When the limestone touches the acid, it makes bubbles. Lisa waits until the reaction stops, and then she weighs the glass and its contents. What should Lisa expect to find about the mass of the glass and its contents when she puts it on a scale?
Answer: Mass is more than 145 g but less than 160 g
Explanation: Acid and limestone reacts forming water, salt and
Carbon dioxide CO2. Because CO2 is gas it is bubbled away from
glass and that's why mass is less than 160 g. Because limestone
releases CO2 and products from acid remain in solution, mass is more than 145 g. If amount of acid in moles is enough, all limestone reacts.
Roughly 44% of mass of limestone CaCO3 forms CO2 and we can estimate mass of gas is 0.44·15 g = 6,6g , so mass would be 153 g
The chromosome of a bacterium
Image result for The chromosome of a bacterium
The bacterial chromosome is one long, single molecule of double stranded, helical, supercoiled DNA. In most bacteria, the two ends of the double-stranded DNA covalently bond together to form both a physical and genetic circle. ... coli, a bacterium that is 2-3 µm in length, has a chromosome approximately 1400 µm long.Answer:
Explanation:
Why is the Pacific Ocean important to marine life?
What is a plantlet?
A small plant
A small leaf-like structure that buds off the edge of leaves, used in asexual reproduction
A small leaf-like structure that buds off the edge of leaves, used in sexual reproduction
A small growth that produces more foliage on a plant
What is a horizontal above-ground stem that produces new daughter plants asexually?
Aboveground stem
Aboveground root
Stolon
Bud
What is apomixis?
The production of roots with developing plant embryo without need for fertilization
The production of roots with developing plant embryo with need for fertilization
The production of seeds with developing plant embryo without need for fertilization
The production of roots without developing plant embryo with need for fertilization
What is the reproduction structure on the flower that is the male part?
Sepals
Petals
Stamens
Pistils
What is the reproduction structure on the flower that is the female part?
Sepals
Petals
Stamens
Pistils
What occurs when pollen for a plant fertilizes its own ovule on the same plant?
Out-crossing
Self fertilization
Other fertilization
In-crossing
What occurs when a plant mates with individuals other than itself?
Out-crossing
Self fertilization
Other fertilization
Self pollination
What happens when two separate structures are joined so that by tissue regeneration they form a union and grow as one plant?
Grafting
Rootstock
Scion
Propagate
Answer:
Its what the person above said ^^