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Which are forms of nitrogen that are usable by humans

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air