How would an increase in nest sites affect a population of pigeons?
athe population would decrease.
bthe population would increase.
cthe population would remain almost the same.
dthe population would be reduced the next year.

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