Final answer:
No, if a fish ate a cow, it would not become a whale. Whales and fish are different types of animals with different evolutionary paths and characteristics.
Step-by-step explanation:
No, if a fish ate a cow, it would not become a whale. Whales and fish are not the same type of animal. Whales are mammals, while fish are not. Although whales and fish may have similar body shapes, they have different evolutionary paths and DNA sequences. Whales have lungs and breathe air, while fish have gills and extract oxygen from water. Therefore, a fish eating a cow would not turn it into a whale.