The answer to this is the remains and waste products of plants, animals and other living things organisms.
Explanation:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar
D because this is the process of when the nitrogenous bases are going to match each other to form our DNA sequence
Yes it can kill brain cells. if you hold your breath for a short amount of time example 10 seconds it won't do any harm. but if you hold your breath for an extended time like a minute the cells will not get enough oxygen and eventually die. I hope I helped you
