Which statement best describes how DNA specifies a genetic trait? A) The four nitrogenous bases of DNA nucleotides always form the same base
pairs.
B) The order of nitrogenous bases in DNA determines the order of amino acids in
proteins.
C) One strand of a DNA molecule serves as a template for making the other
strand.
D) DNA molecules are copied before cell division in the process of DNA replication.

the answer is d.) homologous; have mammary glands

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.