For what reasons is a fanlike diagram a useful model for phylogenetic classification?

Because ancestors more common with each other are closer to the center1000's of species names make more sense by simply looking at it.

Explanation:

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the sun d the answer is sun

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.