The photo shows the entrance to Mammoth Cave. What could have caused the cave to form?
O A. Thermal expansion
B. Dissolved carbon dioxide
0 C. Strong winds
D. Growth of plant roots

B

Explanation:

ap ex

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.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.