What is the definition of ecology​

the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.

the relationship between living things and their surroundings; the study of this subject is called ecology.

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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.