Which statement correctly explains whether more ATP is found in muscle cells or bone cells? More ATP is found in muscle cells because they use energy less efficiently than bone cells.
More ATP is found in bone cells because they grow more and need energy from ATP.
More ATP is found in bone cells because they need large amounts of energy to produce marrow.
More ATP is found in muscle cells because they need large amounts of energy to power motion.

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answer; i believe the correct answer to the above question is ( friction)

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.