Which sentence uses the word "comparison" properly?
Question 2 options:

Remove them all and see if it makes a comparison.

A comparison of the two books showed that the main characters had a lot in common.

B. A comparison of the two books.

Explanation: the word compare means to estimate, measure, or note the similarity or dissimilarity between Things. If you remove ‘them’ all what is there to compare to each other? Nothing. Making the answer the latter sentence.

halibut, flounder, tuna, and trout are all fish. so your first answer is 1.) fish. and since fish is edible, your next answer would be 3). edible

to describe those fishes more thoroughly, some of those fishes live in fresh water, and some of the fishes live in salt water, and that is not a thing that they all have in common. the question is asking what is common with all of the fish, so answer choices 2). fresh water and 4). salt water are not right.