Question

Nitrogen enters the food chain:
a.primarily through soil-dwelling bacteria that "fix" it by attaching it to other atoms.
b.through methane produced by herbivores as a by-product to the breakdown of plant material.
c.through soil erosion followed by runoff into streams and ponds.
d.when rocks dissolved by rainwater become soil and are used by plants as they grow.
e.from the atmosphere when "fixed" by the photosynthetic machinery of plants.

Answer 1

Answer
           Nitrogen enter food chain through soil dwelling bacteria, because these are the first organisms that convert air free nitrogen into compound nitrogen that can easily enter into food chain.