Fossil insects many times larger than any insects alive today have been dated to the Carboniferous and Permian periods. These fossils are evidence that during these periods a. the climate was much warmer than it is today. b. the oxygen concentration of the atmosphere was significantly higher than it is today. c. the carbon dioxide concentration of the atmosphere was lower than it is today. d. insects had fewer competitors for food than modern insects. e. there were fewer predators on insects than there are today.

Fossil insects many times larger than any insects alive today have been dated to the Carboniferous and Permian periods. These fossils are evidence that during these periods a. the climate was much warmer than it is today. b. the oxygen concentration of the atmosphere was significantly higher than it is today. c. the carbon dioxide concentration of the atmosphere was lower than it is today. d. insects had fewer competitors for food than modern insects. e. there were fewer predators on insects than there are today.

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter18: Life's Origin And Early Evolution

Section: Chapter Questions

Problem 14SA: During the Precambrian, _______. a. atmospheric oxygen concentration declined b. bacteria, archaea,...

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