Dolphins are animals that live in water, but they do not have gills. What might this suggest about dolphins?(1 point)
Responses
They have another structure to obtain oxygen.
They have another structure to obtain oxygen.
They do not need oxygen.
They do not need oxygen.
They make their own food.
They make their own food.
They do not need to release carbon dioxide.
They do not need to release carbon dioxide.
They have evolved a unique way to breathe air.
The correct response is: They have another structure to obtain oxygen.
The correct response is: They have another structure to obtain oxygen.
Dolphins, being mammals, require oxygen to survive just like humans. However, unlike fish that have gills to extract oxygen from water, dolphins have adapted to living in water while still being able to breathe air. Dolphins have blowholes on the top of their heads, which they use to come up to the surface and inhale air. When a dolphin surfaces, it expels the old air from its lungs and inhales fresh air through the blowhole. This adaptation allows them to obtain the necessary oxygen they need to survive without having gills like fish.