13. The graphs below illustrate 3 different populations. Graph
1 represents a population of fish introduced into a lake. Graph 2 represents
the world's human population. Graph 3 represents a population of paramecia (a
type of "wee beastie") in a laboratory dish. Study the graphs and
then answer the question below.
In graph 1, the line between points B
and C is wavybecause the carrying capacity has been reached. The population
has roughly leveled off because there is a balance of resources (food, clean
water, and habitat) and fish.
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Slichter