Nitrogen fixing bacteria in soil turns nitrogen gas into Water
Ammonia
Oxygen
Carbon dioxide

Ammonia

Explanation:

Nitrogen fixing bacteria turn nitrogen into ammonia and plants can absorb it

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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.

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