1. A force is * a. a push or a pull
b. only a pull
O c. only a push
O d. none of the above are corect

when it's short and dry.

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.

a. by using fur or clothes to trap heat energy near the body