What is one effect of immigration on a population living in an ecosystem

When a new species immigrates into an ecosystem, the competition for limited resources within the ecosystem increases. The new species tries to fit in the ecosystem by entering into the existing food chains and there by destabilizes the system by feeding on either the producers or the primary consumers. The new species may also cause harm to essential components of the ecosystem, thus it can be harmful as well.

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 : )