Bacteria in soil convert atmospheric nitrogen into a form usable by plants.
Spores are a dormant form of bacteria.
Spores in soil convert atmospheric nitrogen into a form usable by plants.
What can change atmospheric nitrogen into a form used by plants?

a) Conifers
b) mutations
c) Collagen
d) earthworm
e) sugar
f) Enzymes
g) spores
h) wind