Afold in rock that bends upward into an arch is called a(n) a. anticline. b. syncline. c. plateau. d. canyon.

Option- (A): It is the best choice from the given options.

Explanation:

"A folded convex directed upwards in direction( A-Structures), as it due to the process of compression resulting in the formation of the organic mountains."

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.

i think it is dna, i'm not totally sure but i think it might be.