What is the process of succession? O. A. When a species changes from one niche to another niche
© B. When a community is replaced by another community
• C. When one disturbance replaces another disturbance
D. When an ecosystem changes from one biome to another biome

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.

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