Sensory neurons transmit messages

a. from the brain and spinal cord to a muscle or gland.
b. from the brain to the spinal cord.
c. from the environment to the spinal cord or brain.
d. within the brain.

c. from the environment to the spinal cord or brain.

Definition:

Sensory Neurons carry messages from sensory receptors to the central nervous system.

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