Select the correct answer. What term describes a new community replacing an existing community?
O A.
primary succession
OB.
climax community
O c. secondary succession
OD.
seasonal succession
OE.
ecological replacement
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What is thought to have caused the mass extinction at the end of the cretaceous period?

How do cells grow and reproduce to maintain homeostasis?

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed