Why did invertebrates, particularly arthropods, get so large in the Late Paleozoic?

A) There was more moisture in the atmosphere.
B) Ozone in the atmosphere shielded them from ultraviolet radiation.
C) There was more vegetation for them to feed on.
D) There was more oxygen in the atmosphere.


Answer: D

Environmental & Atmospheric Sciences

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Ocean acidification is the decrease of ocean water pH caused by the absorption of excess atmospheric ____ by the oceans.

A. N2O (nitrous oxide) B. CaCO3 (calcium carbonate) C. H2CO3 (carbonic acid) D. CO2 (carbon dioxide) E. CO3 (carbonate ions)

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Glacial ice is primarily "salt" water.

a. true b. false

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Due to friction, the wind at the surface tends to:

a. Blow along the isobars from high to low pressure. b. Converge into low-pressure regions and diverge out of high-pressure regions. c. Blow along the isobars from low to high pressure. d. Converge into high-pressure regions and diverge out of low-pressure regions.

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