BI-1537
Observed and expected ratios
Biology · Secondary 4 · Medium · Observed and expected ratios
In a fish population, the percentage of individuals with heavy body armour increased from 5% to 60% over 40 years. Predatory birds that eat these fish also became more common. Which process best explains the increase in heavily armoured fish?
- Natural selection favouring fish with heavy armour
- Continuous variation caused by changes in water temperature
- Random mating between heavily armoured fish only
- Artificial selection by humans breeding the fish
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