1. The lemmings and voles are prey for a lot of predators. They are the biggest source of food for carnivores in the forest. They're extinction would have disastrous effects on the ecosystem. What type of species are lemmings and voles for this ecosystem?

answer; i believe the correct answer is (a)0

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