Some Animals Have No Gills When Young,but Then Develop Gills

question 5

Multiple Choice

Some animals have no gills when young,but then develop gills that grow larger as the animal grows larger.What is the reason for this increase in gill size?

• A)The young of these animals are much more active than the adult,which leads to a higher BMR and therefore a higher need for oxygen.
• B)Relative to their volume,the young have more surface area across which they can transport all the oxygen they need.
• C)The young have a higher basal metabolic rate.
• D)Relative to their surface area,the young have more volume in which they can store oxygen for long periods of time.

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