When you look at a transverse wave, the distance from the baseline to the crest of the wave is called the wave's .

Amplitude

When you look at a transverse wave, the distance from the baseline to the crest of the wave is called the wave's amplitude

Explanation:

As the transverse wave progresses, the particles are displaced from their position of rest. This maximum displacement is known as amplitude.

As well, the crest of the wave is the region of maximum upward displacement.

Thus, the distance from the baseline (position of rest) to the crest of the wave is wave's amplitude.

the answer for apex is the lowest