Question

Please help

I don't get it because it's a sciency question but on my English work.

Which of the following characteristics do these words have in common?

halibut, flounder, tuna, trout

fish
fresh water
edible
salt water

Answer 1

Those are the names of different types of fish. Therefore, your answer is fish.

Answer 2

The answer is fish. Halibut, flounder, tuna and trout are names of fish.