Which statements describe the importance of the nitrogen cycle to living things? Select two options. A It provides a source of water.
B It helps cells make proteins.
C It provides a form of usable nitrogen.
D It removes carbon dioxide from the atmosphere.
E It destroys harmful bacteria.
F It helps cells make glucose.

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measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

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the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.