These are mixtures of weak acids and the salts of weak acids that tend to maintain constant pH.
A. buffers
B. oxidants
C. electrolytes
D. soft drinks
A. buffers
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Staphlococcus aureus is a bacterium that
causes wound infections. Many strains of S. aureus now exist that have evolved resistance to the potent antibiotic, methicillin. This is an example of ____ selection.
a. directional b. stabilizing c. disruptive d. frequent e. more than one of these types of
This animal has radial symmetry, a
gastrovascular cavity, and the same opening is for the entry of food and expulsion of waste. It is ___.
a. a cnidarian b. a flatworm c. an annelid d. a mollusk e. more than one of these
Which figure depicts a punctuated equilibrium model of evolution? 
A. Figure A B. Figure B
Ringworm is a fungal infection of the skin
Indicate whether the statement is true or false