The level most commonly meant by the term biodiversity is the species level.
Answer:
I believe your answer is fertilization.
both plants and animals can if that helps. So any living being I think...
Answer: b. reaction 3
Explanation: When an enzyme is present in a reaction acts as a catalyst, increasing velocity of reaction and decreasing the activation energy, when not present an enzyme the reaction velocity is very low and implies high activation energy, being unfavorable to the system