Even though nitrogen constitutes 78% of Earth's atmosphere, the amount available for living things nearly all comes from
A)a few groups of nitrogen-fixing bacteria.
B)the breakdown of minerals.
C)a few genera of detritivores.
D)the breakdown of dead plants.

Question

Quizplus · Accepted Answer

Nitrogen-fixing bacteria convert atmospheric nitrogen into forms that can be used by living organisms, making them the primary source of available nitrogen.

Even Though Nitrogen Constitutes 78% of Earth's Atmosphere, the Amount