What are the group of cells that form 4-5 days after fertilization?

it's anything that aren't producers and consumers.

explanation:

you've got to be clear on what "this" is

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 : )