Answer:
If all the plants on earth died, so would the people. ... When green plants make food, they give off oxygen. This is a gas that all animals must breathe in order to stay alive. Without plants, animals would have no oxygen to breathe and would die.
So 200/25 is equal to 8, and because of that, the plot has 8 weeds per square kilometer.
The answer is D. Cellular respiration
