How is usable nitrogen obtained by animals?
a. they produce it in their chloroplasts
b. they get it by eating plants.
c. they get it from the soil.
d. they breathe it in from the air

Drag the tiles to the boxes to form correct pairs. match the causes with their effects cause: tectonic plates at transform boundaries experience friction. cause: tectonic plates at transform boundaries experience friction. cause: earth is covered by a crust that runs miles deep.