The beginning of the Phanerozoic is marked by the ________
A) abundant life forms compared to earlier times
B) formation of large land masses
C) evolution of land plants and animals
D) development of hard body parts, such as shells and bones
E) existence of a modern atmosphere
D
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What is the study of the origin and evolution of Earth, its continents, oceans, atmosphere, and life?
a. physical geology b. scientific method c. cosmology
d. historical geology e. solar nebula
Ecotones are the ________
A) studies of specific biomes by ecologists B) sounds that animal communities make in ecosystems C) areas between territories of organisms D) interactive behaviors leading to communication E) transitional zones between ecosystems
Closely spaced isotherms indicate ____
a. a steep temperature gradient b. a gentle temperature gradient c. a steep pressure gradient d. a gentle pressure gradient
When a thunderstorm is located on the high plains east of the Rocky Mountains, a much larger portion of the storm will typically be located above the freezing level, so hail has a better chance of occurring
a. True b. False