GUYS PLEASE HELP The models represent the stages of the cell cycle in the random order.
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Which stage of the cell cycle shows the formation of spindle fibers and chromatin condensing into chromosomes?
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it takes hundreds of years to become stable.

if you have another question lmk.

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.