Energy is the currency of the cell, just like money is the currency of our society. Please compare the process of energy transfer in photosynthesis & cellular
respiration with the process of money transfer through our banking system.

enzyme speed up the reactions

this is a good question! i'll do some research and come back when i have the answer!

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 correct answer is 2 and 4