A. Decreasing amount of energy needed to start a reaction.
I believe the answer is PREZYGOTIC isolating mechanisms
Answer:
reflection I took the test
Biological Organisms: Living things that are capable of reacting to stimuli, reproduction, growth, and homeostasis. Organisms are classified by taxonomy into specified groups such as the multicellular animals, plants, and fungi; or unicellular microorganisms such as a protists, bacteria, and archaea.
