In the first sentence, the way in which the author combines clauses after the main verb "is" ("what makes an artist. . . A good work of art") indicates that he

What percentage of the earth's water is available for use by living things?

Analyze the forces acting on a cyclist who is slowing down as he or she climbs a hill

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome