Question

Four fishermen fished for the same amount of time in different ponds. Which catch most likely came from the pond with the highest level of dissolved oxygen?
A. Catch A
B. Catch B
C. Catch C
D. Catch D

Answer 1

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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