Two kinds of birds eat the same food and nest in the same area these two species of birds are in?

symbiosis

Explanation: If too many herbivores live in a community, the predator population will decrease rapidly.

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.

cell division is not regulated in tumor cells.