Answer:
In the absence of sunlight the plants which are dependent on sunlight for making food that is photosynthesis would die.
Also the people will suffer as sunlight is a good source of Vitamin D and in absence of sunlight they will not get it so easily.
Answer:
b. the ocean regulates climate
Explanation:
The substrate is the part that sticks into the active site of an enzyme.
I think the answer is oxygen, but not 100% sure
