Which of the following is a characteristic of the plasma membrane? It is made up of one layer of phospholipids.
It doesn't contain any molecules aside from phospholipids.
The outward-facing phospholipid tails give it a rough quality.
It allows some molecules to pass through but prevents others from doing so.

D. It allows some molecules to pass through but prevents others from doing so.

Explanation:

Plasma membrane or cell membrane is a selective permeable membrane which allows light molecules to pass and prevents heavy molecules.

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what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

gold i'm pretty sure i might be wrong