What to the end of the Yellow Fever epidemic of 1793?

The government cleaned the drinking water around Philadelphia

Cold weather killed off the mosquitoes

Scientists discovered a vaccine

B. Cold weather killed off the mosquitoes

Explanation:

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.