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Anastaziya [24]
3 years ago
11

Vitamin D precursors are produced in the skin in the presence of sunlight. These chemicals are important for the transport of so

dium in our intestines. Vitamin D precursors are produced in the skin in the presence of sunlight. These chemicals are important for the transport of sodium in our intestines. True False
Biology
1 answer:
denpristay [2]3 years ago
7 0

Answer:

False.

Explanation:

Vitamin D is very important for our body because it helps absorb, transport and fix calcium rather than sodium, as the question above says. In addition, this vitamin prevents disease and promotes bone maintenance. In order for her to perform her duties, one usually has to expose oneself to the sun.

One of the tips to find out if your body is missing this vitamin is to look at the skin. The sun is responsible for synthesizing vitamin D in the body. So if your skin is darker it is a sign of deficiency as pigment protects the skin and prevents absorption.

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How is it possible for organisms to undergo both punctured equilibrium and gradualism?
lawyer [7]

Answer: Gradualism and punctuated equilibrium are two ways in which the evolution of a species can occur. A species can evolve by only one of these, or by both. Scientists think that species with a shorter evolution evolved mostly by punctuated equilibrium, and those with a longer evolution evolved mostly by gradualism.

Explanation:

6 0
2 years ago
How a vaccine promotes immunity?<br>answer in your own words​
anygoal [31]

Answer:

Because the vaccine is an antigen from living, weakened or killed microorganisms that activate the immune system and the body produces protective antibodies.

8 0
3 years ago
Explain Mercury is the planet closest to the Sun. Why does it get so cold at night?
alexdok [17]

Answer/Explanation: On Mercury temperatures can get as hot as 430 degrees Celsius during the day and as cold as -180 degrees Celsius at night.

Mercury is the planet in our solar system that sits closest to the sun. The distance between Mercury and the sun ranges from 46 million kilometers to 69.8 million kilometers. The earth sits at a comfy 150 million kilometers. This is one reason why it gets so hot on Mercury during the day.

The other reason is that Mercury has a very thin and unstable atmosphere. At a size about a third of the earth and with a mass (what we on earth see as ‘weight’) that is 0.05 times as much as the earth, Mercury just doesn’t have the gravity to keep gases trapped around it, creating an atmosphere. Due to the high temperature, solar winds, and the low gravity (about a third of earth’s gravity), gases keep escaping the planet, quite literally just blowing away.

Atmospheres can trap heat, that’s why it can still be nice and warm at night here on earth.

Mercury’s atmosphere is too thin, unstable and close to the sun to make any notable difference in the temperature.

Space is cold. Space is very cold. So cold in fact, that it can almost reach absolute zero, the point where molecules stop moving (and they always move). In space, the coldest temperature you can get is 2.7 Kelvin, about -270 degrees Celsius.

Sunlight reflected from other planets and moons, gases that move through space, the very thin atmosphere and the surface of Mercury itself are the main reasons that temperatures on Mercury don’t get lower than about -180 °C at night.

6 0
3 years ago
Classify the following gas planets as terrestrial planets or gas giants
kkurt [141]
<h2>Answer:</h2><h3>Part 1.</h3><h3> Celestial body A is the largest planet in the solar system.</h3>
  • It is Jupiter which is a <u>Gas giants.</u>
  • Jupiter is mostly made of gas.

According to above statement, It is the Jupiter which  largest planet in our solar system.  Jupiter's mass is more than 300 times that of Earth, and its diameter, d, at 140,000 km.

<h3>Part 2. </h3><h3>Celestial body C has optimum conditions to sustain life.</h3>
  • It is earth which is a<u> terrestrial planet.</u>
  • Because it is mostly made of silicate rocks and minerals.

According to statement, earth is that planet because it has living optimum conditions. Like the oxygen concentration, water, plants etc.

<h3>Part 3.</h3>

Celestial body E has the most volcanoes in our solar system apart from earth. It is the second closest planet to the sun.

  • It is Venus and it is a<u> terrestrial planet.</u>

Venus orbits sun every 224.7 Earth days.

It has the longest rotation period of any planet and it rotates in opposite direction to most of the planets in the Solar System.

<h3>Part 4.</h3><h3>Celestial body H is the second largest planet in the solar system and has visible rings.</h3>
  • It is Saturn which is a <u>gas giant.</u>
  • Because it is mostly consists of gases and it also has ring of gases around itself.

it is 9.4 times as large as the Earth. It also has a large and bright ring system.

<h3>Part 5.</h3><h3>Celestial body D has 17 times more mass than earth and has gravity that is 1.14 times that of earth. </h3>
  • It is Neptune and it is a <u>gas giant</u>.
  • It has mostly gaseous composition, such as hydrogen and helium.

Neptune is the eighth and farthest known planet of the Solar System. It is also the third most massive planet.

<h3>Part 6.</h3><h3>Celestial body G has a core that consists of iron sulfide mixed with nickel and is the second smallest planet in the solar system.</h3>
  • It is mars and it is a<u> terrestrial planet</u>.
  • Mars is the second smallest planet while mercury is first smallest planet after the exclusion of Pluto from solar system.

The surface of mars is covered by talcum powder type dust. It contains elements besides silicon and oxygen, are iron, magnesium, aluminum, calcium, and potassium.

<h3>Part 7.</h3><h3>Celestial body I had a core composed of nickel iron alloy rock surrounded by an outer layer of hot fluid. The fluid contains water, ammonia, and methane body I has 27 moons .</h3>
  • This is Uranus and it is a<u> gas giant</u>.
  • is the seventh planet of the Solar System.

According to radius, it is on third number and according to mass it is forth largest planet. Its composition is more similar to Neptune.

<h3 />







6 0
4 years ago
A child is prescribed hematopoietic stem cell transplantation for severe combined immunodeficiency disease. what is administered
mezya [45]
The child is administered to use Intravenous immunoglobulin and Pneumocystis caranii pneumonia or PCP prophylaxis. These are used to improve humoral immunity in the child until the time when the transplant is performed.
The child is not recommended to use influenza vaccine in immunodeficiency disease reason being the possibility of acquiring influenza which is severe.
Again the child is not recommended to use varicella vaccine because it can lead to a risk of acquiring chicken pox.
For a child with PCP, we use Dapsone.
3 0
3 years ago
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