Ecology, Evolution, and Practical/Experimental Skills
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Biology Q & A Practice 1 of 5 A-Level exam-style exercises in this topic
Measurement or observationValue
Initially marked (M)80
Second catch (C)100
Marked recaptured (R)20
Estimate MC/R400
Figure 1: evidence supplied for the question

In a mark–release–recapture study, 80 animals are marked. Later, 100 are caught and 20 are marked. What population estimate is obtained?

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