3. When did the rate of respiration is more than the rate of photosynthesis? 1) Plant will die.
2) Storage food comes to end.
3) Quantity of O, decreases in atinosphere.
A) 1 true
B) 2 true
C) 1 and 2 true
D) 2 and 3 true​

15

Explanation:

the precursor of vitamin d made in response to uv light is cholecalciferol. It was converted from 7-dehydrocholesterol by using UV light. 
Sunlight is a vital component in vitamin D because the skin needs it to make vitamin D. Vitamin D is helping calcium absorption, thus helping to keep teeth and bone. Vitamin D is also available from diet source.