Auseful classification

a. gives each organism a unique name

b. shows evolutionary relationships

c. changes the taxon of an organism based on new data

d. all the above

because the light is a great source of energy for the plants to survive. (i hope this )

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.