The figure below has a black line that shows how birth rate, a vital rate, changes with population size. Gray boxes indicate different regions of the figure, labeled with letters. Birth Rate A Population Size (N) Negative density- dependence B Match the terms below to the part of the figure that represents them best: Positive density- dependence (Allee effect) Exponential growth 1. Region A с 2. Region B 3. Region C

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Population Growth

R and K Selection

R and K selection are concepts in ecology used to describe traits in the fluctuation of a population or population dynamics. For example, they describe the life-association traits between parent and offspring, such as quantity or number of young ones born at a time, quality of parental care, the age to maturity, and reproductive effort.