When it came to explaining the origins of variation within species, darwin?

had no idea of the true causes.

in most cases the individuals who possess favorable traits are more likely to survive

there's the proffessional site that will you.

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