Define the process of respiration in one sentence

Respiration is the process by which organisms exchange gases with their environment, taking in oxygen and releasing carbon dioxide.

What is the word equation for respiration

The word equation for respiration is: glucose + oxygen -> carbon dioxide + water + energy.

Define the process of photosynthesis 8n one sentence

Photosynthesis is the process by which plants and other organisms convert light energy into chemical energy in the form of glucose, using carbon dioxide and water.

Animals are using up oxygen all the time. Why dies the amount of oxygen in the atmosphere not go down? Answer in one sentence.

The oxygen in the atmosphere is constantly replenished through photosynthesis carried out by plants and other photosynthetic organisms.