Effective participation in group discussions requires an exchange of ideas, constructive debate, and

an argument
a timekeeper
some courtesy
an agenda

Effective participation in group discussions requires some courtesy, among other things. In order to be heard, you need to hear, understand, acknowledge different opinions and then show your point of view. Without courtesy the debate doesn't happen, no one is satisfied with the discussion, and a lot of feelings can get hurt.

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.