Artificial selection section
cathy read about whales and learned that the average length of a blue whale is 80 feet. she also read that they can grow to be 94 feet long. cathy wondered if the length of the blue whale is genetic.
if two whales of maximum length mated, the selection in this case would (what)

I believe 80 is the answer you are looking for

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