Answer:
H2O and O2
Explanation:
water and oxygen is required for photosynthesis
A. One good thing happens and other good things happen because of it.
Answer: Natural variation.
I believe the answer is C.
because when the dinosaurs thrived they ate most of the mammals which were small animals but when the dinosaurs went extinct the mammals grew larger in size and started to thrive.
I think it's when glycogen turns glycogen into glucose and vice versa. Not too sure though.
