Middle School Life Science Quiz
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BIOLOGICAL EVOLUTION: UNITY AND DIVERSITY
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A population of snails has variation in shell thickness: thin or thick. The environment includes a crab predator that crushes shells and remains present. Data collected over 12 years:
Crab attacks (percent surviving an attack):
- Thick shells: 75%
- Thin shells: 25%
Population trait frequency:
- Year 1: thick 35%, thin 65%
- Year 12: thick 68%, thin 32%
Traits can affect population outcomes. Which claim is unsupported by the evidence?
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