2points
which are forms of nitrogen that are usable by humans?
o
a. ammonia, nitrates, nitrites
o
b. oxygen, carbon, water
o
c. nodules, roots, fertilizer
o
d. phosphorus, nitrates, nodules

explanation:

okay now i don't know this but for the pints nothing else to say bye

if you look up in the top right corner you'll see your current profile picture, click than click "view profile" you'll be able to change it there.

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: