One purpose of the world’s fair, held in seattle in 1962, was to

The major theme of the fair was to show that the United States was leading  the realms of science and space. The US Government  was really interested in demonstrating the nation's scientific prowess to the world, and so committed over $9 million to the fair, chiefly to build the NASA-themed United States Science Exhibit .

One purpose of the World's Fair in Seattle in 1962 was to bring order to exposition scheduling and to make clear the rights and responsibilities of the host city and participants.Approximately 10 million people attended this fair and The Century Twenty One made a profit as well.

This exposition gave Seattle worldwide recognition,effectively putting it on the map.

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.