If earth’s atmosphere is made up of 78% nitrogen, why is nitrogen a limiting factor for producers? A.
Consumers respire all of the available nitrogen.

B.
Nitrogen is unusable in its liquid form.

C.
There are more plants than gaseous nitrogen.

D.
Nitrogen is unusable in its gaseous form.

Nitrogen gas (N2) makes up nearly 80% of the Earth's atmosphere, yet nitrogen is often the nutrient that limits primary production in many ecosystems. Why is this so? Because plants and animals are not able to use nitrogen gas in that form.

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: