5 important parts of trees then discuss their important role for development of resource.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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the correct answer is c   with the systems

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.