Explain why scientists believe the Abert’s and Kaibab squirrels are examples of speciation.

The Abert’s squirrel is found on the south rim of the grand canyon and surrounding states.

The Kaibab squirrel can only be found at the north rim of the canyon.

Scientists believe they were separated by plateau erosion that separated the forests of the Grand Canyon, isolating the Kaibab population of squirrels.

Explanation:

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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