When discussing magma or lava, chemical composition refers to which of these? select all that apply. a. dissolved gases b. crystalline structure c. types of chemical elements d. amounts of chemical elements

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.