Which would be considered an ecosystem? A
a colony of bacteria
B
biotic factors in a forest
с
populations of zebras and lions
D
living and nonliving things in a pond

An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. Biotic factors include plants, animals, and other organisms

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A colony of ants is a species,  C is only animals and only the biotic factors it is D living and nonliving things in a pond

Explanation:

within 30 of the equator hope this

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.