12. An atom with an atomic number of 34, and a mass number of 79 has: protons
neutrons
electrons
b. 45 Protons, 45 Neutrons, 34 Electrons
a. 34 Protons, 45 Neutrons, 34 Electrons
c. 45 Protons, 34 Neutrons, 34 Electrons

Answer is A.

Explanation:

atomic number is number of protons.

atomic mass is protons + neutrons

and electrons = number of protons

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.