Which is an abiotic factor that affects a freahwater?

The amount of light that the water receives depends on the time of day and season, depth, how clear the water is, what the weather is like, and the altitude of lakes. Streams and rivers usually have very high light levels due to shallowness and movement of particles, but can vary in places. Wetlands have very low light levels due to usually murky, stagnant water, and unvarying depth hope this helps!

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explanation:

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.