7. Fats, oils, and cholesterol are all types of a. cell membranes.
b. hormones.
C. lipids.
d. fatty acids.
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What role do bacteria play in the carbon cycle

What are four key elements of the study of economics?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.