Which statement best illustrates a biotic or an abiotic factor that is often found in a city park?
o decaying leaves are an abiotic factor because they are not living
o rocks are an abiotic factor because they have never been alive.
o water in ponds is a biotic factor, because it provides a habitat for living things.
o oxygen is a biotic factor, because it is required for life and found in all living things.

Rocks are abiotic

Explanation: They arnt alive so how can it be biotic?

the second choice is correct

Explanation:

Decaying leaves are a biotic factor. Rocks, water and oxygen are all nonliving, so they are abiotic factors.

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 : )

well, i believe that the answer is 2. : 3