An earthquake caused ocean water to fill a large valley and isolate a group of 20 mice on a large hill that became a new island far from land. The population of mice breeds but shows less genetic variation than the population that remained on land. This is an example of

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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 solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

gag reflex, poor dentition, gum retraction

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