A population ecologist is studying the demographics of American bison living on a grassland in North Dakota. She

captures, marks, and releases 100 bison. Later, she recaptures 100 bison and discovers that 50 were previously marked
and half of those marked are of reproductive age. What is the population ecologist’s estimate of how many bison in the
total population are of reproductive age?



a. 200
b. 50
c. 100
d. 20
e. 10


ANSWER: c

Biology & Microbiology

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