One of the reasons study of nitrogen use in plants is of special interest is because:
A. nitrogen is limited in our atmosphere.
B. nitrogen in its atmospheric form is not useable by plants.
C. nitrogen is often toxic to plants.
D. none of the forms of nitrogen is easily absorbed by plants.
E. nitrogen is not an essential element for plant growth.
B. nitrogen in its atmospheric form is not useable by plants.
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A student is describing the tissue that makes up the walls of the alveoli in the lungs. It appears that these walls are composed of flattened cells arranged in a single layer to facilitate gas exchange
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A. citric acid B. methanol C. ethanol D. hyaluronidase E. aspartame