Easy. Answer is oxygen because it says which one was missing before any life was on earth. And in order to have life on earth you need oxygen!
:)
The population size of a predator species is directly controlled by the population size of it's prey. If the predator has no prey the population size will go down because they have no food.
Answer:
Here are a few characteristics of life that humans and bacteria share
Explanation:
- Reproduction
- Evolution and adaptations
- Organization
- pH homeostasis
- Responds to stimuli
Explanation:
yes .....................