Modern whales lack hind limbs and have tail flukes and ears specialized for hearing underwater. Which of the following is the correct order for the evolution of these whale characteristics?
a. Loss of hind limbs followed by tail flukes and underwater ears
b. Loss of hind limbs followed by underwater ears and and tail flukes
c. Tail flukes followed by loss of hind limbs and underwater ears
d. Underwater ears followed by tail flukes and loss of hind limbs

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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.

i hope this : )

the answer is b. glad to .