Is an enzyme that prevents telomeres from degrading by adding more repeating dna to the ends.

Telomerase

Explanation:

Telomerase enzyme catalyze the reaction of maintaining the length of telomeres, preventing it from degradation or shortening by adding guanine rich sequences towards the end of DNA. Telomeres basic function is to maintain and protect our genetic information because every time DNA replicates a short piece of chromosome is lost.

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.

not only is it colder, it also becomes darker, less salty, and more dense.