Which is an example of hybridization that would increase hybrid vigor?

Hybrid organisms contain DNA from both male and female parents but cloned organisms contain DNA from only one type of parent. Hybrid has superior character over its parents (improved hybrid vigor) but clones are 100% identical to their parent. Hybridization gives only one hybrid progeny, whereas through cloning unlimited identical organisms can be produced.

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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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