Biological macromolecuels fall into four main classes.

a. True
b. False

A. True

Explanation:

Carbohydrates, lipids, proteins, and nucleic acids are the four major classes of biological macromolecules.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

the menstrual cycle – higher tier. negative feedback mechanisms affect the production of hormones in the menstrual cycle. oestrogen also stimulates the release of lh (luteinising hormone) from the pituitary gland, which in turn controls the production of progesterone.