, which is an essential biological compound found in DNA and amino acids that make up proteins, occurs in the atmosphere in an unusable form. This element must undergo the process of , which is facilitated by bacteria in the roots of plants.

a.)
Nitrogen; fixation

b.)
Hydrogen; transpiration

c.)
Hydrogen; photosynthesis

d.)
Nitrogen; transpiration

ok

explanation:

answer:

i havent taken the psat, but i have the sat, make sure to bring some snacks, because youre in there forever, 2 sharp number two pencils, an sat approved calculator, and maybe a jacket.   your phone and any books will be taken up, so don't try to bring them(but they will be given back at the end of the testing).   good luck!   i hope you do well!