Which of the following is NOT a step in identifying the pathogen that causes a specific disease? A. The pathogen should be found in the body of a healthy organism.
B. The pathogen should be isolated and grown in a pure culture.
C. The purified pathogens should cause the same disease in a new host.
D. The pathogen should be isolated from the second host.

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils