Answer:
Flat terrain/Same moisture.
Explanation:
This option seems to make the most sense.
1. Acceleration of impulse
2. Deceleration of impulse
Enzymes speed up the chemical reaction that takes place in cells. they are also important for digestion and metabolism.
Electrons are only located in specific shells or orbitals that surround the nucleus of an atom. Therefore, I believe that your answer would be true. Hope it helped some!