Which of the following structures is the richest in lipid content? a. arachnoid mater b. dura mater c. white matter d. gray matter

The c. white matter is the richest in lipid content  of the structures mentioned in the previous list.

Explanation:

our brain  has long and organized neurons and connections that constitute white matter and gray matter.

Gray matter is composed of the bodies of neurons and their axons (their nerve endings).Gray matter differs from white because gray matter does not have myelin.

on the other hand, white matter is a substance very rich in lipids, which gives it its white color.This substance is composed of higher myelinated fibers

The dura and arachnoid are part of the cerebral meninges, are those structures responsible for protecting the central nervous system, especially the brain from external agents in order to have proper functioning. These are formed by a very vascular connective tissue.

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."

answer:

i didn't even do anything

explanation: