Darwin believed that giraffes acquired longer necks by slowly stretching to reach leaves located higher above the
ground.

true

false

False

Explanation:

He believed that they were born with a long neck by chance, and that those with longer necks survived and had offspring with similar features.

b.

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