Nitrogen Is Often the Limiting Nutrient in Ecosystems

question 55

Multiple Choice

Nitrogen is often the limiting nutrient in ecosystems.This is because

• A) there is very little nitrogen on Earth, compared with other nutrients.
• B) most nitrogen is in the form of N₂, which organisms cannot use.
• C) the chemical reactions needed to produce usable nitrogen are difficult.
• D) nitrogen is quickly removed from ecosystems and stored in rocks and sediments.
• E) humans turn most available nitrogen into ammonia, which organisms cannot use.

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