Explica los problemas para los científicos para medir la edad de los narvales.

just here for the other one bc they put up with u

life would be meaningless without memes

the wires in the toaster turning red and the toast crisping and turning brown

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.