Gamma rays are produced by applying 1)electric and magnetic fields parallel to each other
2)crests and thoughts at right angles to each other
3)electric and magnetic fields at right angles to each other
4)crests and troughs parallel to each other

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.

sex cells are usually half's then they find another half and make a fertilize egg

answer; ///the above statement is (true);