Samples with cherry only: \( 95 - 40 = 55 \)
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- So 56% detect exactly two.
- An entomologist uses DNA barcoding to identify pollinators. Out of 180 insect samples, 105 carry pollen from apple trees, 95 from cherry trees, and 40 carry pollen from both. How many samples carry pollen from only one type of tree?
- Samples with apple only: \( 105 - 40 = 65 \)
- Total with only one: \( 65 + 55 = 120 \)
- An ornithologist studies a flock of 200 birds. 120 use route X, 100 use route Y, and 50 use both. The rest use a rare alternate route. How many use the alternate route?
- Birds using route X or Y: \( 120 + 100 - 50 = 170 \)
