the plasma membrane a. is rigid and impermeable b. is free of proteins c. is permeable to ions and polar molecules d. is composed mostly of cholesterol e. controls the contents of the cell

bilayer

Explanation:

The plasma membrane is SEMIpermeable, it can allow certain materials like nonpolar molecules to pass though its membrane so choice A is wrong. Choice B is also wrong because the plasma membrane is a phospholipd bilayer, meaning it has proteins. Choce C isn't correct  because cholesterol is not composing most of the membrane.

Choice E is your best answer because the most important function of the plasma membrane is to control what enters and exits the cell.

Hope this helps and makes sense to you! Good luck.

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.

the dna of humans and mice is almost 92% similar. this similarity indicates that . mice have a tail, while humans have a tailbone. the tailbone is a structure in humans.yes it's true.