What is the basic unit of structure and function in all living organisms?

Cells

Explanation:

Cells are the basic unit of structure and function of all living organisms. The order of organization in multicellular organisms are cells, tissues, organs, organ systems, and organisms. This is because this is how it ranks - cells make tissues, tissues make organs, and etc.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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the correct answer is 2 and 4