Which of these sentences is true about nitrogen?
as nitrogen is the rarest gas in the atmosphere, very few organisms can use it directly.

even though nitrogen is an abundant gas in the atmosphere, very few organisms can use it directly.

even though nitrogen is an abundant gas in the atmosphere, no organisms can use it directly.

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Air is a mixture if that is what your asking.

4. a b and cprocess included are: 1. reproduction, is as vital for an entire race to survive. it prolongs their generation onwards and offspring to the next centuries to pass by. 2. obtaining energy. in both humans and animals, even plants is a challenge because these creatures need to work in order to obtain these need resource from food –preys. 3. maintaining structure. for the living organisms to still exist they need to keep themselves intact. combating diseases and having nutrition. this is a by-product of having energy. 4. irritability. responding to stimulus5. excretion. able to dispose waste6. movement. being able to be in one place to another.7. growth. able to develop.8. death.