Distinguish between active and passive transport

Passive transport does not require ATP energy to be spent by the cell; active transport involves the cell spending energy to move materials.

Molecules naturally move from areas where they are abundant (high concentration) to where they are less common (low concentration) in a process called diffusion. Some molecules will cross in or out of a cell membrane in this way without the cell having to spend any energy to do so. This is passive transport.

When the cell wants to build up an excess of molecules on one side of the cell membrane (inside or outside) it must spend energy to counteract the tendency towards diffusion (described above). The cell must spend energy to do this and this is referred to as active transport.

not only is it colder, it also becomes darker, less salty, and more dense.

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