A: has a specific active site
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Correct Answer: B. Catch B
Explanation: Fish depend on dissolved oxygen to survive. Ponds with high levels of dissolved oxygen will support more fish (and larger fish) than ponds with low levels of dissolved oxygen. Trout are particularly sensitive to dissolved oxygen levels, so a pond with a healthy trout population probably has high levels of dissolved oxygen.
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Answer:
Scientists use the fossils around the new fossil to find its relative age.
Explanation: