Which lobe of the cerebrum contains the primary motor cortex and is the most anterior lobe?

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.

i am sorry but i need more information and a picture.

these objects are classified under the concussion or idiophone group.