In a fresh water lake a population of bony fish called the stickleback were studied over several decades the presence of a armor plating over the bodies of the males was noted the data is shown below what explains the trend shown in the data for the fresh water Sticklebacks

biology is the study of life. it is the study of living organism.

explanation:

idk

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.