During the Cenozoic, brachiopods ____
A)greatly expanded their numbers and diversity
B)were greatly reduced in number of genera
C)took over habitats previously occupied by mollusks, forcing those creatures to go extinct
D)became the most important marine invertebrate phyla
E)became extinct
B
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In the process of getting energy to power your television, which of the following stages is the most energy efficient?
A. Thermal conversion of the energy from coal in the power plant B. Burning the coal to run the power plant C. Actually powering your television set D. Transmission to your house E. Mining the coal to run the power plant
Atoms that have an electrical charge due to a gain or loss of electrons are called ________
A) isotopes B) ions C) periodic elements D) isochrons
Which of the numbers listed below best represents the percentage of thunderstorms that produce tornadoes?
A) nearly 25 percent B) slightly more than 50 percent C) fewer than 1 percent D) about 10 percent
One of the most abundant groups of microorganisms on the planet is ________.
A. copepods B. Prochlorococcus C. marine group I Archaea D. tintinnids