How do i explain the relevance of a research question

When I am writing a research paper, or answering questions, I typically find a reliable source and use facts to prove how the said subject is relevant.

Example: I had a paper over how William Shakespeare was relevant/influenced the modern marketing/business world. My claims as to why he was relevant were that he is one of the most well known names in history, and he has built a brand around his name (his playwrights) that can be associated with him. I used a quite from an article where someone had said that Shakespeare has built himself as the biggest brand, whether it was he who built it.

idk= i don't know the answer

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.