Caffeine belongs to a large class of nitrogen-containing natural products called . a. alkaloids
b. carbohydrates
c. amines
d. terpenes

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Nonpoint source pollution is difficult to control because it

Which statement best describes the he properties of iconic compounds ?