Why do growth rates appear to be declining in many human populations?
A) Families are choosing to have fewer children.
B) Death rates are increasing due to disease epidemics and famines.
C) Birth rates are decreasing due to famine.
D) The carrying capacity has been reached.
A
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Animals that help other animals of the same species _____
A) have excess energy reserves B) are bigger and stronger than the other animals C) are usually related to the other animals helped D) are always male E) have defective genes controlling their behavior
How does the amount of yolk relate to the nourishment of the organism?
a. An egg with a small amount of yolk contains all of the nutrients for the embryo's development. b. An egg with a large amount of yolk contains all of the nutrients for the embryo's development. c. An egg lacking yolk contains all of the nutrients for the embryo's development. d. There is no relationship between the amount of yolk and the nourishment of the organism. e. All animal eggs have the same amount of yolk and provide the same amount of nourishment.
Memory cells that form during a primary immune response circulate in the blood for
a. several days. b. weeks. c. months. d. many years. e. a few minutes.