Question 17 of 35 Which two characteristics describe the most-stable ecosystems on Earth? O A. They are near the poles. - B. They have high biodiversity C. They are near the equator. D. They have few seed plants. Brainleast​

answer; i believe the correct answer is (sporophyte);

substitution is the answer in this case

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 : )