Nitrogen-fixing bacteria

a. repair nitrogen-damaged legume roots
b. convert atmospheric nitrogen into ammonia
c. damage the environment by using atmospheric oxygen to produce toxic nitrogen compounds
d. convert ammonia in the soil into nitrogen gas

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: