Question 3 of 5 Which two characteristics do all nonvascular plants have in common?
A. They lack flowers and seeds.
B. They lack the ability to reproduce.
C. They lack vessels that carry water.
D. They lack cells with chlorophyll.

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.

the answer is c because it is most logical.