Motion and acceleration may only be used to refer to physical objects moving or changing speed/direction

True

Explanation:

It is TRUE that Motion and acceleration may only be used to refer to physical objects moving or changing speed/direction.

This is because if an object is not moving or changing speed/direction to a determined point of reference, the object is considered to be at rest or motionless, thereby, with no absolute point of reference, absolute motion or acceleration cannot be distinguished.

show the wavelengths of a wave. show the crests of a wave.

the answer is mosques. they are an important part of islamic culture.