A cell membrane is said to be a bilayer. What forms the two layers? A) Phospholipid molecules that self-arrange tail-to-tail

B) Proteins and carbohydrates with electrons

C) Aquaporins and proteins with opposite charges

D) Phospholipid molecules that self-arrange head-to-head

A

Explanation:

allowed for the prediction of the properties of missing elements.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.