3) Mendel arrived at his second law of inheritance when he studied a) one trait at a time
b) one generation at a time
c) two traits at a time
d) two generations at a time
4) Traits Mendel studied in pea plants included
a) flower color
b) stem length
c) seed color
d) all of the above

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.

oxygen +1 most likely

well the answer is 2!