the heart of an embryo starts to pump blood by the ________.
Answer:
fourth week of pregnancy
Explanation:
Mark me brainly please
why is mechanical digestion of food important?? please help I only need one reason marking brainliest btw
Answer:
it makes the food smaller
Explanation:
Mechanical digestion is a purely physical process that does not change the chemical nature of the food. Instead, it makes the food smaller to increase both surface area and mobility. It includes mastication, or chewing, as well as tongue movements that help break food into smaller bits and mix food with saliva.
The concentration of sodium on the inside of the cell is 20 mM. The outside of the cell has a sodium concentration of 115 mM. Which mechanism of ion uptake would best move sodium from the inside of the cell to the outside? osmosis diffusion passive transport active transport.
Answer:
It's active transport
Explanation:
The mechanism of ion uptake that would best move sodium from the inside of the cell to the outside is active transport.
What do you mean by Ion uptake?Ion uptake may be defined as the process of movement of ions from one side of the membrane to the other.
Active transport helps in the movement of ions against the concentration gradient. It also requires energy. The active transport of small molecules or ions across a cell membrane is generally carried out by transport proteins that are found in the membrane.
Therefore, the mechanism of ion uptake that would best move sodium from the inside of the cell to the outside is active transport.
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Help me with this please
Answer:
4.Red
5. gamma waves
5. Gamma waves
Explanation:
if you look at the visible light they label all the colors for you red is at the end closest to increasing wavelength
What is the importance of sea-floor spreading?
Answer:
Significance. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
Explanation:
If you breathed in air that had a lower oxygen concentration than your blood, describe what would happen in your alveoli.
Answer:
internal respiration
Explanation:
internal respiration is described by what your asking so that shows the in your alveoli would react with internal respiration and if it says im wrong then i dont what.
Which adaptation is most likely to help a plant obtain water in a dry environment?
A. A waxy stem coating
B. Many sharp spines
C. A brightly colored flower
D. Many shallow roots
Please help me answer!!
Answer:
spines lose less water in hot enviroments and help protect against against animals so B.
What is the probability that a couple will have a type A child if the mother has Type
A blood and is heterozygous for the trait and the father has type AB blood?
Answer:
50%
Explanation:
To solve this, we'd need to use a Punnett square. Since the mother has a heterozygous genotype and has an A-blood phenotype, we know that she is AO and the father is AB.
A B
A AA AB
O AO BO
According to this, the four possible blood types, with equal probability are: AA, AB, AO, and BO. Both AA and AO genes will result in type-A blood, since A is dominant over O. Therefore, there is a 2 in 4 (or 1 in 2, or 50%) chance of the child having type-A blood.
What is the main purpose for plants to conduct photosynthesis?
which soil composition would be the best choice for lining a landfill?
Answer:
Loamy or silty soils that are free of large stones and excess gravel are the best cover for a landfill. Clayey soils may be sticky and difficult to spread; sandy soils are subject to wind erosion.
Explanation:
the digestive system of most animals is lined with cells through which nutrients are absorbed. what is the embryonic origin of these cells?
Answer:
Further breakdown of food takes place in the small intestine where enzymes produced by the liver, the small intestine, and the pancreas continue the process of digestion. The nutrients are absorbed into the bloodstream across the epithelial cells lining the walls of the small intestines.which division of the ans is referred to as the rest and digest division?
What are the little hairs that line the nasal cavity and help trap microorganisms?
Answer:
c. Cilia is correct
Explanation:
the adaption, of Xylem cells is formation of a ________________.
I want the answer of this question please as fast as possible
Answer: The adaption, of Xylem cells is formation of a hollow tube.
Explanation:
Which statement is true,please anwser i put more points
A, Individual genes are made of chromosomes
B, Most genes are made up of more than one DNA molecule
C, Some inherited traits influence more than one gene
D, Inherited traits develop because of the instructions in the gene
Answer:
I think B is right It can be wrong too
Answer: (D) Inherited traits influence more than one gene.
Explanation:
If there is oxygen around, how will yeast cells make ATP?
ummm mom mm mmmmmmmmmmmmmm
Observa el mapa de las fallas tectónicas de la Hispaniola y luego escribe las instrucciones
Porfa díganlo. rapido
Answer:
El 14 de agosto de 2021, un terremoto de magnitud 7,2 sacudió Haití. El terremoto más grande en la región desde 2010, el desastre dejó al menos 2,000 personas muertas, 12,000 personas heridas y casi 53,000 casas destruidas.
the age of fossils can sometimes be determined by radiometric dating, which is based on the constant rate of decay of radioactive isotopes. the time required for half of a radioactive isotope to decay is called the half-life of that isotope. for example, the isotope carbon-14 has a half-life of 5,730 years.
Answer:
17,190 years Radiometric dating is a technique for determining the age of fossils that is based on the fact that specific radioactive isotopes decay at a constant rate.
Explanation:
explain the effects of removing one organism from a terrestrial food web
Answer: If one species in the food web ceases to exist, one or more members in the rest of the chain could cease to exist too. A plant or animal doesn't even have to become extinct to affect one of its predators.
Explanation:
What evidence of climate change on continents supports the theory of continental drift?
signs that glaciers existed in South Africa
similar coal fields on different continents
change in atmospheric temperature over time
same animal fossils found on different continents
Answer:
A
Explanation:
Edge2022
The evidence of climate change on continents that supports the theory of continental drift is similar coal fields on different continents. Hence option B is correct.
What is continental drift theory?The theory of continental drift suggests that the Earth's continents were once joined together in a single landmass called Pangaea, which began to break apart around 200 million years ago.
This idea was first proposed by German scientist Alfred Wegener in the early 20th century, who noticed the striking similarities between the coastlines of Africa and South America.
Coal is formed from the remains of plants that lived millions of years ago, and its distribution can provide clues about how continents were once connected.
Coal fields found on different continents that match in age and composition indicate that the continents were once joined together in a larger landmass.
This supports the theory of continental drift, which states that the continents were once part of a single supercontinent that later broke apart and drifted into their present positions.
This evidence suggests that coal-forming swamps once existed in locations that are now separated by oceans and that these locations were once connected.
Hence option B similar coal fields on different continents is correct.
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which choice is considered an integral membrane protein?
Answer:
not sure if this is multiple choice but the answer is a protein with its N-terminus in the cytoplasm and its C-terminus in the extracellular space
we inhale o2 and we exhale co2. carbon dioxide is produced __________.
hi plz someone talk to me
Answer:
yes sure what's the topic!?!?!?
If one plant is named Salvia greggii and another is named Salvia vanhouttei, what does this tell you about these plants?
A.) They belong to the same genus and can interbreed.
B.) They belong to the same genus and to different species.
C.) They belong to the same species and to different genuses.
D.) They belong to the same species and can interbreed.
Answer:
They belong to the same species and to different genuses.
Explanation:
look at the picture below. what word describes what is happening to the nutrients and water in the biome?
Given what we know about the water cycle we can confirm that the process that happening in the biome is the process of condensation
Although the water cycle can be divided and subdivided into various processes, we can simplify it into four simple steps:
EvaporationCondensationPrecipitation CollectionThe one saw in the biome and one of the most essential parts of the cycle is condensation. It is the collection of water molecules into a single group that, when dense enough, fall back onto the earth as rainfall. In nature these take the form of clouds, meanwhile, in the biome, they appear as water on the sides of the container.
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Answer:
recyled
Explanation:
now you’ll examine an operon that undergoes negative and positive control. the ara operon in e. coli codes for enzymes that metabolize the sugar arabinose, which e. coli can use for energy. as you can see in the diagram, the regulatory protein arac can act as both an activator and a repressor of the ara operon.
The lac operon is known to be able to undergoes negative and positive control.
The diagram based on the 4 table arrangement is filled up below (Right to left);
In the presence of arabinose: initiator, activator, yes, yes.In the absence of arabinose: initiator and operator, repressor, no, no.
If a mutation prevents arabinose from biding to AraC: initiator and operator, repressor, no, no.
If arabinose is present but a mutation and AraD enzyme renders it non-functional: initiator, activator, yes, no.
The metabolism of the sugar arabinose is known to be influenced by an operon that is said to undergo both positive control and negative control.
Transcription of the ara operon is lead by the regulatory protein AraC, which then bound to the DNA.
When arabinose is present, it binds to AraC, and both parts of the AraC dimer are then also bound to the initiator, making transcription to move foreword.
When arabinose is absent, one part of the AraC dimer is often bounded to the initiator, while the other part is bounded to the operator, thereby hindering transcription.
See full question below
Now you'll examine an operon that undergoes negative and positive control. The ara operon in E. coli codes for enzymes that metabolize the sugar arabinose, which E. coli can use for energy. As you can see in the diagram, the regulatory protein AraC can act as both an activator and a repressor of the ara operon.
Use the diagram above to fill in the table.
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You have a water plant in a test tube. You place it outdoors. At what TIME OF DAY will
the oxygen level in the tube be the LOWEST?
What would happen if I jump out of a plane without my parachute
Answer:
umm you would not live
Explanation:
when was the last time that you had your vital signs taken ?how was the result?
Answer:
Normal vital sign ranges for the average healthy adult while resting are: Blood pressure: 90/60 mm Hg to 120/80 mm Hg. Breathing: 12 to 18 breaths per minute. Pulse: 60 to 100 beats per minute.Vital signs are measurements of the body's most basic functions. The 4 main vital signs routinely checked by healthcare providers include: Body temperature. Pulse rate.Checking vital signs is an important skill to learn, because it tells us how the person's body is functioning, helping us to monitor current conditions and alerting us to changes in health status. It can also give us clues to possible medical conditions that have yet to be diagnosed.
Match the color components of light with the resulting color of light
A. Yellow
B. White
C. Magenta
D. Cyan
____1. Red + Green
____2.Red + Blue
____3. Green + Blue
____4. Red + Green + Blue
Answer:
» 1. A. Yellow » 2.C. Magenta» 3.D. Cyan » 4.B. White