Information and IdeasMediumFinding supporting a claim about an animal's diet
Information and Ideas practice question
A biologist claims that the otters in the estuary now feed mainly on the crabs that have recently colonised the mudflats rather than on fish.
Which finding, if true, would most directly support the biologist's claim?
- A. Otter droppings collected on the estuary this year contain far more crab shell fragments than fish bones, the reverse of samples from five years ago.Correct
- B. Otters are able to eat crabs.
- C. The estuary's fish population has been stable.
- D. Crabs have colonised the mudflats.
Answer: A. Otter droppings collected on the estuary this year contain far more crab shell fragments than fish bones, the reverse of samples from five years ago.
The droppings' contents, then and now, show the switch.
Why the other answers are wrong
- B. Otters are able to eat crabs.
- Ability is not evidence of what they mainly eat.
- C. The estuary's fish population has been stable.
- Says nothing about what otters eat.
- D. Crabs have colonised the mudflats.
- The crabs' arrival is the premise, not evidence about the diet.
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