Relatively large areas of land and water ecosystems are needed to provide the resources used by a typical american, as identified by the large ?

This indicator is an estimate of the amount of space on the earth that an individual uses in order to survive using existing technology. This space includes the biologically productive land and water area that produces the resources consumed by that individual such as food, water, energy, clothing, and building materials. It also includes the amount of land and water required to assimilate the wastes generated by that person. In other words, the ecological footprint measures a person's demand on the bio-capacity of the Earth.

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where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?