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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 (basal metabolic rate) 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 BMR.
D. Relative to their surface area, the young have more body volume in which they can store oxygen for long periods of time.

Respuesta :

Some aquatic animals have no gills when young, but then develop gills that grow larger as the animal grows larger because the young of these animals are much more active than the adult, which leads to a higher BMR (basal metabolic rate) and, therefore, a higher need for oxygen.

Some aquatic animals do not have gills when young, but develop larger gills as the animal grows. Juveniles of these animals are much more active than adults, resulting in a higher BMR (basal metabolic rate) and higher oxygenation requirements.

Since the ancestors of these aquatic mammals had lungs, they are 'stuck' in the respiratory system - that is, no animal, such as tuna or goldfish, is known to have 're-evolved' gills. breath. Spinal animals lost their gills and developed lungs when they came to land.

Gill less aquatic animals are whales and dolphins. These animals cannot breathe underwater without gills, so they come to the surface to breathe. Whales and dolphins are mammals that breathe from their lungs.

Learn more about aquatic animals here : https://brainly.com/question/26810968

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