What did the Ancient Greek and Romans use to magnify objects?

Most ancient lenses are convex and were used to magnify. At Carthage there are 14 glass lenses and two of rock crystal stored in a drawer in the museum; they have apparently never been displayed.

Explanation:

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.