<span>Enzymes lower the activation rate of a reaction, thus lowering the energy needed to start a reaction.</span>
Answer:
The answer is Eurasia, North America, Africa, and South America.
Explanation:
here is the answer of this qquestion
Vasoconstriction
Definition-The blood vessels under your skin become narrower. This decreases blood flow to your skin, retaining heat near the warm inner body.