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

Correct 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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not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.