Which statement best describes the plasma membrane?

a. it is nonpermeable to substances outside of the cell

b. its rigidity does not allow materials to enter the cell.

c. it is freely permeable to all substances.

d. it is selectively permeable to certain substances

D) It is selectively permeable to certain substances.

Explanation:

The plasma membrane is like the military of the cell. It's function is serving and protecting the cell from it's surroundings. Composed of proteins, it is very selectively permeable. This means it allows certain types of molecules or ions to pass on through it as a active or passive transport.

The correct answer is D

Explanation:

The plasma membrane is sorta like the military of the cell. It's function is to serve and protect the cell from it's scary surroundings! Composed of proteins, it is selectively permeable. Meaning it allows certain types of molecules or even ions to pass on through it, as in active or passive transport. Hope this helps! Have a blessed day!

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.