Which of the following best describes the producers in a terrestrial food web? They are unaffected by decomposers.
They obtain their energy from consumers.
They convert energy from the sun to chemical energy.
They are at the top of the energy pyramid.

Explanation:A

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.