1. At -100 °C, which substances would be solid? 2. At -100 °C, which substances would be a liquid?
3. At -100 °C, which substances would be a gas?
4. Which substances are solid at 80 °C?
5. Which substances are liquid at 80 °C?
6. Which substances are gases at 80 °C?

not too sure maybe olecranon process

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.