The nervous and endocrine systems both send signals through the body. One difference is a
Endocrine system signals travel faster
b
Endocrine system relies on the bloodstream
c
Endocrine system signals travel faster
d
Nervous system develops later in childhood

what image you forgot to include it.

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 its the first one

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.