Abiologist discovered a young four legged animal .the animal had lungs seemed to fertilize internally and it's outer surface was covered with scales in which class of animal is biologist likely to place the animal

I personally would classify this animal as Reptilia because this sounds like a reptile to me. I hope this helps! :)

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.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.