Answer:
In order for pregnancy to happen, sperm needs to meet up with an egg.
The answer is A. Coniferous forest
to temperate forest
B, the discovery of new evidence resulted in changes to the cell theory,
Answer:
A substance that speeds up a chemical reaction—without being a reactant—is called a catalyst. The catalysts for biochemical reactions that happen in living organisms are called enzymes. Enzymes are usually proteins, though some ribonucleic acid (RNA) molecules act as enzymes too.
Explanation:
