During the Pleistocene epoch, ____
A) continental glaciers continuously covered large parts of North America and Europe
B) it was much warmer than it is now
C) continental glaciers alternately advanced and retreated over large portions of North America and Europe
D) tropical vegetation was growing over vast regions of the Central Plains of North America
C
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Which is higher in an endothermic reaction: the potential energy of the reactants or the potential energy of the products?
A. In the early stages of the reaction, the potential energy of the reactants is higher. In the later stages, the potential energy of the products is higher. B. The potential energy of the reactants is the same as the potential energy of the products. C. The potential energy of the products is higher than the potential energy of the reactants. D. The potential energy of the reactants is higher than the potential energy of the products.
Which of the following terms refers to the change of state of water from a liquid to a vapour?
A. condensation B. evaporation C. freezing D. sublimation
From most general to most specific, which is the most accurate hierarchical representation of cultural units?
A) complex, realm, region, trait B) realm, complex, region, trait C) realm, region, complex, trait D) trait, complex, region, realm
The Earth is warm due to ________.
A. greenhouse gases B. albedo C. blackbody radiation D. All are correct.