Question

how do whales differ from fish?
a. whales use blowholes for breathing.
b. whales have scales that cover their skin.
c. whales develop lungs following metamorphosis.
d. whales reproduce through external fertilization.

Explanation:

Whales are mammals. Mammals are air - breathing vertebrates. Blowholes are a characteristic feature of whales for breathing air, which is different from fish that use gills to extract oxygen from water. Fish have scales covering their skin (B is wrong for whales), whales do not undergo metamorphosis like some amphibians (C is wrong), and whales have internal fertilization (D is wrong).

Answer:

A. Whales use blowholes for breathing.