Minerals a. contain plant material b. can be solids, liquids, or grass c. have a uniform structure or composition d. are made from the remains of the plants and animals

C

Explanation: One of the basic things that minerals must have is a cyrstal structure. A, B, and D cannot be correct because minerals cannot have organic material.

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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