Most fish exchange gases using gills on either side of the pharynx (throat). Gills are tissues which consist of threadlike protein structures called filaments. These filaments have many functions including the transfer of ions and water, as well as the exchange of oxygen, carbon dioxide, acids and ammonia.
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<u>B</u><u>.</u><u> </u><u>a </u><u>test </u><u>for </u><u>the </u><u>presence of </u><u>things</u><u> </u><u>t</u><u>h</u><u>a</u><u>t</u><u> </u><u>can </u><u>change </u><u>size </u><u>quickly</u><u>,</u><u> </u><u>since</u><u> </u><u>it</u><u> </u><u>would </u><u>be </u><u>an </u><u>indication </u><u>of </u><u>growth </u><u>and </u><u>development </u>
Answer:
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