Magnification is x100. What is the actual size of one of these epithelial cells?

Answer:

fish and tetrapods are both vertebrates that have a backbone with a spinal cord. fish lived before tetrapods because their fossils are in rocks over 500 million years old.

Explanation:

fish and tetrapods are both vertebrates that have a backbone with a spinal cord

Answer:

Explanation:

For an organism to be fossilized, the remains usually need to be covered by sediment soon after death. Sediment can include the sandy seafloor, lava, and even sticky tar. Over time, minerals in the sediment seep into the remains. The remains become fossilized

Answer:

i got u

Explanation:

For an organism to be fossilized, the remains usually need to be covered by sediment soon after death. Sediment can include the sandy seafloor, lava, and even sticky tar. Over time, minerals in the sediment seep into the remains. The remains become fossilized.

Trilobites were exclusively marine animals. They were first appeared at the beginning of the Cambrian Period. In the context Jellyfish existed before trilobites and ammonites.

To find the age of fossil, scientists use some type of clock to determine the date it was formed.

Geologists usually use radiometric dating procedures which is based on the natural radioactive decay of some elements such as potassium and carbon, as reliable clocks to date ancient events.

In the given context, jellyfish fossils are found lower than trilobite fossils, and trilobite fossils are found lower than ammonite fossils. Which determines that jellyfish existed before trilobites and ammonites.

Thus, the correct option is B.

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Answer:

B

Explanation:

Its the Answer

Answer: Some of the components in tobacco smoke include:

Nicotine (the addictive drug that produces the effects in the brain that people are looking for)

Hydrogen cyanide.

Formaldehyde.

Lead.

Arsenic.

Ammonia.

Radioactive elements, such as polonium-210

Benzene.

Explanation: Highly damaging components of tobacco smoke include:

tar – is the word for the solid particles suspended in tobacco smoke. The particles contain chemicals, including cancer-causing substances (carcinogens). Tar is sticky and brown, and stains teeth, fingernails and lung tissue

carbon monoxide – is a poisonous gas. It is odourless and colourless and, in large doses, quickly causes death because it takes the place of oxygen in the blood. In people who smoke, the carbon monoxide in their blood makes it harder for oxygen to get to their organs and muscles

oxidizing chemicals – are highly reactive chemicals that can damage the heart muscles and blood vessels of people who smoke. They react with cholesterol, leading to the build-up of fatty material on artery walls. Their actions lead to heart disease, stroke and blood vessel disease

metals – tobacco smoke contains several metals that cause cancer, including arsenic, beryllium, cadmium, chromium, cobalt, lead and nickel

radioactive compounds – tobacco smoke contains radioactive compounds that are known to be carcinogenic.

The effects of tobacco smoke on the body include:

raised blood pressure and heart rate

constriction (tightening) of blood vessels in the skin, resulting in a drop in skin temperature

less oxygen carried by the blood during exercise

‘stickier’ blood, which is more prone to clotting

damage to the lining of the arteries, which is thought to be a contributing factor to atherosclerosis (the build-up of fatty deposits on the artery walls)

reduced blood flow to extremities (fingers and toes)

increased risk of stroke and heart attack due to blockages of the blood supply.

Answer:

nicotine.

carbon monoxide.

tar.

toxic chemicals such as benzene, arsenic and formaldehyde.

Their actions lead to heart disease, stroke and blood vessel disease.  tobacco smoke contains several metals that cause cancer.

Explanation:

The secretion of adh is directly stimulated by Osmoreceptors.

Osmoreceptors are the specialized neurons of hypothalamus that is resposible for monitoring changes in intercellular osmolality. If the concentration of electrolytes increases then ADH secretion is affected.

So we can conclude that the secretion of adh is directly stimulated by Osmoreceptors.

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Answer: C

Explanation:

Any of the above are possible

lower since it is becoming more acidic

The absorption of carbon dioxide from the air by the oceans causes the ocean's pH to become lower, meaning it becomes more acidic. Therefore option (A) is correct.

The ocean's pH can be affected by a variety of natural and human factors. One of the primary factors affecting the ocean's pH is the absorption of carbon dioxide from the atmosphere. As carbon dioxide dissolves in seawater, it reacts with water to form carbonic acid, which increases the concentration of hydrogen ions (H+) in the water and lowers the pH.

Other factors that can affect the ocean's pH include volcanic activity, which can release large amounts of carbon dioxide and other chemicals into the ocean, and nutrient runoff from land, which can lead to algal blooms that increase carbon dioxide and lower the pH. Human activities, such as burning fossil fuels and deforestation, can also release large amounts of carbon dioxide into the atmosphere, contributing to ocean acidification.

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The mass of the astronaut is the same in both places. However, the weight is different due to the variation of gravity.

Weight is a term that refers to the force with which the Earth or another celestial body attracts a body due to the action of gravity. It is measured in Newtons.

Mass is a term that refers to a physical magnitude and general property of matter that expresses the inertia or resistance to the change of movement of a body. It is measured in kilograms.

The weight of a body is not the same on Earth as on the Moon because the Moon is smaller and the force of gravity is less. Therefore, the weight of the astronaut will vary depending on the gravity with which he is attracted to the center.

On the other hand, the mass of the body does not vary even if the astronaut is in different places such as the Earth or the Moon, because he will always occupy the same space.

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Kingdom Protista is the classification given to eukaryotic organisms composed of microorganisms that cannot be registered within the fungi, plant and animal kingdoms.

Eukaryotic-type organisms that, due to their characteristics, are not part of the kingdoms of fungi, plants and animals, make up the kingdom protista.

This groups a very diverse set of generally unicellular or simple multicellular organisms that do not form tissues, both autotrophic and heterotrophic.

Therefore, we can conclude that Kingdom Protista is the classification given to eukaryotic organisms composed of microorganisms that cannot be registered within the fungi, plant and animal kingdoms.

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The action that describes an experimental investigation is measuring the temperatures at which two rock samples melt (option A).

Experimental investigations involve a process in which a test is designed and variables are actively manipulated, controlled, and measured in an effort to gather evidence to support or refute a causal relationship.

An experiment is conducted under controlled conditions to either;

demonstrate a known truth

examine the validity of a hypothesis

determine the efficacy of something previously untried

According to this question, measuring the temperatures at which two rock samples melt shows an action taken that exemplifies an experimental investigation.

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The sequence of bases on RNA that would match or pair with the following DNA sequence: GCA is CGU.

Transcription is the process by which mRNA sequence is produced from a DNA template in the nucleus of a cell.

During transcription process, the following applies:

This means that the mRNA sequence that will result from a template of DNA with sequence: GCA is CGU.

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Answer:

Selective breeding

Explanation:

Answer:

A

Explanation:

Took the test!

Answer:

For the second generation, Mendel cross-pollinated two hybrids that had purple flowers. About 75 percent of the second-generation plants had purple flowers. These plants had at least one dominant factor. Twenty-five percent of the second-generation plants had white flowers.

The results of Mendel's second set of experiments led to his second law. This is the law of independent assortment. It states that factors controlling different characteristics are inherited independently of each other.

Answer:

A protist

Explanation:

Trust me.

Answer:

Cas9

Explanation:

Genome editing techniques have been developed to exploit the CRISPR system of bacteria and archaea. Only the Cas9 component of the system is used in editing.

Answer:

a) aquifers

Explanation:

Looking at the answers choices, 3 of the answers have something in common. Oceans, rivers, and lakes all have their surfaces exposed to the atmosphere—including the direct path to the sun. This means that they evaporate the most into the atmosphere.

Aquifers are underground wells, meaning they only evaporate slightly into the atmosphere due to high levels of heat energy. However, they stay mostly underground and are not in the direct path of the sun's energy.

Answer:

Demography

Explanation: Demography is the study of human populations – their size, composition and distribution across space – and the process through which populations change. Births, deaths and migration are the 'big three' of demography, jointly producing population stability or change.

CSF flows from the lateral ventricles, via the interventricular foramens, and into the third ventricle, cerebral trench, and the fourth ventricle.

CSF flows from the lateral ventricles to the third ventricle via the foramen of Monro, it flows across the cerebral trench of Sylvius to the fourth ventricle and onto the subarachnoid space through the cracks of Magendie and Luschka.

Thus,CSF flows from the lateral ventricles, through the interventricular foramens, and into the third ventricle, cerebral trench, and the fourth ventricle.

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Answer:

Mar 29, 2007 · Child Artists' Tools Include Mixed Media, Maggots Letting kids dip maggots into paint may sound merely disgusting — but there's an entomologist from U.C.-Davis who calls it …

Explanation:

By making "maggot art," Ms. O'Flaherty is utilizing maggots in a distinctive way.

A great approach to get kids interested in insects, especially fly larvae, is through maggot art. Although it is mostly geared towards kids between the ages of 6 and 14, parents and siblings of all ages find it entertaining as well! Prepupillary blow fly larvae are submerged in non-toxic solution as the main assumption.

Fly eggs are laid everywhere there is a protected area and a fresh food source again for new brood of maggots to feed on. Maggots hatch from these fly eggs. As a forensic entomologist, Ms. O'Flaherty frequently employs maggots to, among other things, ascertain the time of death through investigation and examination. Three main positive benefits of maggots on wounds include debridement, disinfection, and improvement of wound healing.

Thus, by making "maggot art," Ms. O'Flaherty is utilizing maggots in a distinctive way.

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Answer:

The top layer of rock in a rock formation is the oldest.

Explanation:

it's A

Answer:

9.807 m/s²

Explanation:

Hope this helps!

Answer:

9.807 m/s²

Explanation:

Explanation:

DNA is tightly packed up to fit in the nucleus of every cell. As shown in the animation, a DNA molecule wraps around histone proteins to form tight loops called nucleosomes. These nucleosomes coil and stack together to form fibers called chromatin.

Answer:

Plants. Some Bacteria. Algae. These 3 are the photosynthetic autotrophs..

Why the others don't fit:

Athropods are hetertrophs. Not all bacteria are autotrophs. Only some protists are autotrophs.

Answer: Muscular System

Explanation:

The Muscular System creates the movement a swimmer needs to swim across a swimming pool.

Answer:

The uterus no longer produces eggs [ova] which results in infertility and since the eggs are no longer produced there will no monthly blood flow [menstruation]