Dams are barriers that prevent the flow of water. they are created to provide flood control, recreational areas, water for irrigation, and hydroelectric power. although dams serve many important purposes, they can also have a negative impact on the environment by a. serving as a place for people to have picnics. b. increasing fresh water sources for humans. c. providing new wildlife habitats. d. preventing fish from moving along a river.

As Dams act as Obstruction to the Natural Flow of the River, they Prevent fish from moving along the River (i.e.) either from Sea to River or From River to Sea.

So : Option D is the Answer

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when the displaced particles are perpendicular to the direction the wave travels, is called a transverse wave, whereas in longitudinal wave the displace practices are parallel to the direction of the wave.

in the given image:

first image shows - longitudinal wave

second image shows - transverse wave

third image shows - longitudinal wave

fourth image shows - longitudinal wave