Which of the food chains shown would be best from an energy-transfer
point of view?

grain --> human

sun energy --> plants --> grain -> cattle -> human

ooo
algae -> tadpole --> fish -> human

insect -> trout -> human

answer: oof wait

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.

i hope this : )

if you know your abc's you should be able to get your answer or just use google