Coral and algae have a reciprocal relationship in which the algae perform photosynthesis, providing the coral with some nutrients and with the calcification process. in return, the coral provide the algae with certain nutrients and a place to live in a lighted environment. this is an example of a relationship.

Mutualism

Explanation:

It is a relationship that benefits both species.

coevolution relationship

Explanation:

coevolution is the process that occurs between two or more species that reciprocally affect each other life. this occur when two or more species benefits from each other.

for example: flowering plant and insect (in the process of pollination), predator - prey, host-parasite relationship

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 : )