The Cenozoic Era began approximately ________ years ago.
A. 4.55 billion
B. 531 million
C. 65 million
D. 252 million
E. 2.6 million
Answer: C
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Land use changes and exotic species introductions tend to have the impact of
A) favoring K-selected species. B) creating a dynamic equilibrium in species populations. C) reducing the area covered by ecotones. D) reducing biodiversity.
Which of the following human activities has resulted in the conversion of nearly 50% of the Earth's land surface?
A) Construction of roads and bridges B) Construction of all homes and buildings C) Agricultural production of crop and animal products D) Construction and operation of mines
Which of the following sites would have the most dangerous volcanoes? A is on an island arc, B is in the Andes, C is near Hawaii, D is along a mid-ocean ridge.
A. A and B B. A and C C. B and C D. B and D E. C and D
Most of the solar radiation incident upon the Earth is within the ________ part of the spectrum
A) short wave B) long wave C) infrared D) x-ray E) radar