Which of the following describes how vestigial structures provide evidence to support that life changes over time?
a. some animals exhibit similar structures, possibly due to a common ancestor
b. some animals exhibit similar stages of embryonic development
c. some animals exhibit structures that are no longer used for any purpose
d. some fossils exhibit similar biological proteins
! will give correct answers if possible.

i think its A. some animals exhibit similar structures, possibly due to a common ancestor

answer; polycythemia is the correct answer;

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