15.) What happens to hormone levels if a woman becomes pregnant? 16.) Why does menstruation begin?
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15.) What happens to hormone levels if a woman becomes pregnant?

A.) Estrogen and progesterone are the chief pregnancy hormones.

16.) Why does menstruation begin?

A.) Period happens because of changes in hormones in the body. 

-TheUnknownScientist

The hormonal and physiological changes that come with pregnancy are unique. Pregnant women experience sudden and dramatic increases in estrogen and progesterone. They also experience changes in the amount and function of a number of other hormones. These changes don’t just affect mood.

Explanation: hope it helps

b. to discover aspects of the natural world.

hopefully i .

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.