Which is correct about electromagnetic and mechanical waves?

Electromagnetic waves occur when a charged particle decelerates, but mechanical waves occur when charged particles
accelerate.

Electromagnetic waves are transverse but mechanical waves are longitudinal.

Electromagnetic waves move much slower than mechanical waves.

A mechanical wave needs a medium for its propagation, but an electromagnetic wave can travel through a vacuum.

I think it is the second one if I remember correctly

1: the largest region of the brain is the:

  cerebrum

2. the term "psychology" literally means:

the process or procedure of the science or study of the mind.

3. the area of the brain responsible for respiration, heart rate, and smooth muscle control of our blood vessels is t

medulla oblongata

4. the structure that conducts nerve impulses to and from the brain and serves as a reflex center for some sensory information without input from the brain is the:

spinal cord

5. the three-layered membrane that covers the brain and spinal cord and literally means membrane is called the:

meninges

6. the cord-like (string-like) structures that carry bio-electrical impulses from one part of the body to another are called

nerves

7. a group of nerve cell bodies that are found outside of the spinal cord and brain are referred to as:

ganglions or ganglia (pl.) “literal meaning knot”

8. the term that means spinal cord inflammation is:

myel/itis

every el niño cycle is different. every year.