Tides describe the regular rising and falling of the ocean water. tides are caused by

1.the rotation of the moon on its axis
2.the gravitational pull of the sun and moon
3.large storm systems over oceans
4.earthquakes on the ocean floor

the gravitational pull of the wsun an moon

Explanation: correct answer

4

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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