Answer:
Gills
Explanation:
In order to remove oxygen from the water, they rely on special organs called "gills." Gills are feathery organs full of blood vessels. A fish breathes by taking water into its mouth and forcing it out through the gill passages.
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How Do Fish Breathe
Because it’s more likely that chance events will significantly change the frequencies of alleles in the population
The correct answer to your question is the last one; how species change over time.
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