<span>If you place flaccid plant cells in pure water, water moves into the cell because it has a lower concentration of a solution than a concentration inside the cell. This solution (pure water) is called hypotonic solution. As a result, the cell is swelling.</span>
Answer:
Lightly pigmented people tend to be at higher risk of vitamin D deficiency
Explanation:
BACKGROUND KNOWLEDGE:
Human skin is the largest organ of the body which makes boundary line between environment and internal conditions. Human skin cell produces pigment called melanin when ever it is subjected to Sun. More the melanin pigment produced more will be the skin darkens. Ultraviolet (UV) radiations also come from Sun and responsible for more pigmentation.
ANSWER EXPLANATION:
According to the question darkly pigmentation only occurs when their is high level of UV radiations. High level of UV radiations are also responsible for Vitamin D production.
People with lightly pigmented means that there environment has low level of UV radiations which are the requirement of Vitamin D production. Hence due to low UV radiations peoples with light pigmentation's are also be at higher risk of vitamin D deficiency
Probably B) strenuous exercise. If not B then it's probably A. I don't know for sure though
<span>A: The proportions of a population that are at different age levels make up the population’s age structure. </span>
C. The lungs can better exchange oxygen
