Answer:
b. Only about one-half of the world's population relies on sunlight to maintain adequate vitamin D nutrition
Explanation:
Dark skin pigments slow down the synthesis of vitamin D, so black people need to spend more time in the sun to absorb enough vitamin D, so the letter A is incorrect.
Prolonged exposure to sunlight degrades the precursor of vitamin D, whereas prolonged exposure to sunlight produces vitamin D3, which acts to regulate heart function and blood pressure. With this we can conclude that the letter C is also incorrect.
Vitamin D deficiency is not caused by calcium deficiency, on the contrary, vitamin D deficiency is a cause of calcium deficiency. In addition, summer vitamin D synthesis stocks are usually not sufficient to meet summer vitamin D requirements. That is why the letter D is also incorrect.
We can conclude, then, that the correct answer is the letter B. The main source of vitamin production is through sun exposure, because type B ultraviolet rays (UVB) are able to activate the synthesis of this substance. Some foods, especially fatty fish, are sources of vitamin D, but the sun is responsible for 80 to 90% of the vitamin the body receives. It can also be produced in the laboratory and given as a supplement when there is a deficiency and for the prevention and treatment of a variety of diseases.
<h3><u>Answer;</u></h3>
68 calories
<h3><u>Explanation;</u></h3>
- <u><em>Carbohydrates is one of the biomolecules, others being nucleic acids, lipids and proteins. Carbohydrates are the major sources of energy in the body.</em></u>
- Carbohydrates are made up of carbon, oxygen and hydrogen. They are classified as monosaccharides, disaccharides and polysaccharides.
- <em><u>Each gram of carbohydrates yields energy equivalent to 4 calories. Therefore, 17 grams will yield (17×4) 68 calories.</u></em>
I think the correct answer is option D. T<span>he benefits of natural change to ecosystems compare to the disadvantages most likely would be that there are no disadvantages to natural change in ecosystems. If the changes are natural, then it happens because it just happens so probably it will not have any disadvantages or benefits.</span>
