Will give brainiest!! The nervous system is the major controlling, regulatory and communicating system in the body. It is the center of all mental activity including thought, learning and memory.

(A) Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.
(B) Like other systems in the body, the nervous system is composed of organs, principally the brain, spinal cord, nerves and ganglia
. (C) These, in turn, consist of various tissues, including nerve, blood and connective tissue.
(D) Sensory input is converted into electrical signals called nerve impulses that are transmitted to the brain.

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

The answer is 4 i don't know if its right let me see.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Nonmetal are moldable and easily shaped