. Critical Thinking: The Big Idea processes and patterns in nature. Answer the following question on the lines provided. After the results of one experiment, a scientist decides that a long-held scientific theory must be revised. Describe what must be done first before the scientific theory is changed.

sorry I don't know

Explanation:

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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.