1) The loss or removal of nitrogen or nitrogen compounds is.. a) Nitrogen uptake b) Harber process c) Denitrification d) Nitrogen Fixing  2) What is the Harber Process? a) When a plant puts nitrogen into the soil b) When nitrogen is extracted from the air and hydrogen is obtained from natural gas.  c) When plants absorb nitrogen from the water d) When ammonia is going into the air and into the atmosphere   3) What year did Rosalind Franklin, Francis Crick, and James Watson discover nitrogen in DNA? a) 1964 b) 1972 c) 1957 d) 1953 4) Ammonia is.. a) A nitrogen enzyme b) The part of the atmosphere made of nitrogen  c) A compound of nitrogen and hydrogen NH3 d) A plant that puts nitrogen into the soil 5) Sinks in nitrogen are... a) Atmosphere b) Nitrogen fixing bacteria c) Precipitation d) Volcanic eruptions 

Nitrogen cycle (lock four)

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