Why might it be more useful to classify bacteria and archaea based on their morphology

Both domains are capable of sharing segments of DNA with unrelated organisms which makes genetic classification difficult

Explanation:

Prokaryotic living beings, generically called bacteria (Monera Kingdom), belong to two distinct groups: bacteria and archaea. Their differences are so significant that they can be classified as two separate kingdoms (or domains), depending on the classification system. However, both domains have a striking feature that is the ability to share DNA segments with unrelated organisms.

This makes classification difficult based on genetic material, so it would be more useful to classify bacteria and archaea based on their morphology.

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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