An aquaculture facility hatched salmon eggs and tagged and released young fish into a river leading to the ocean. the fish fed and grew in the ocean, and in a few years some of the fish returned to the facility whereas some were found at other locations. because the number of returning fish was low and the facility wanted to increase the rate of return to the facility, a scientist suggested adding a chemical to the river that would

enable them to imprint on the facility

Explanation:

The addition of the chemicals to the river will help the fishes to recognize that this was their native habitat where they got birth and grew. This will act as a imprint formed by the facility which will help the fishes to recognize the water of the facility. This will help in increasing the number of fishes which return back to the facility.

The answer is D. it contains a very variety of trees and shrubs.

Explanation:

Swamps tend to form when water stagnates in a region, causing not only terrestrial trees to grow, but also aquatic plants. These swamps are characterized by being very wooded areas, where the soil has poor drainage, which leads to water stagnation, although this tends to be shallow. The swamps can be both salt water and fresh water.