Chapter 8.2 Review (8th) Question Preview (ID: 35932)
Eras Of The Geologic Time Scale.
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Fossils indicate that some of the first animals to live on land were
a) crawling insects.
b) dinosaurs.
c) large salamanders.
d) reptiles.
Before an ozone layer formed and reduced the radiation reaching the Earth’s surface, most life existed
a) in the air.
b) in trees and plants.
c) in oceans and underground.
d) on land.
Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain
a) carbon dioxide.
b) nitrogen.
c) gases.
d) ozone.
What are the best-known reptiles of the Mesozoic era?
a) salamanders
b) birds
c) dinosaurs
d) plants
What happened to almost all living things from the Paleozoic era?
a) They came to land.
b) They moved to the oceans.
c) They died out.
d) They were eaten.
A billion years after Earth formed, what kind of living things appeared?
a) smaller, less complex
b) gas
c) larger, more complex
d) fossil
gas that cyanobacteria sent into oceans and air
a) cyanobacteria
b) ozone
c) oxygen
d)
a layer of gas around the earth that keeps out radiation
a) cyanobacteria
b) ozone
c) oxygen
d)
living things that first made food from sunlight
a) cyanobacteria
b) ozone
c) oxygen
d)
How many cells did the first living things, prokaryotes, have?
a) none
b) one
c) hundreds
d) thousands
What are the four biggest eras in geologic history?
a) Precambrian, Paleozoic, Mesozoic, and Cenozoic
b) Precambrian, Prehistoric, Mesozoic, and Cenozoic
c) Prehistoric, Mesozoic, and Cenozoic, and Modern
d) Prehistoric, Paleozoic, Mesozoic, and Modern
The most recent geologic era, beginning 65 million years ago; also called the Age of Mammals
a) Mesozoic era
b) Cenozoic era
c) Paleozoic era
d) Precambrian time
A gas in the atmosphere which absorbs harmful radiation from the sun
a) carbon
b) oxygen
c) ozone
d) nitrogen
Organisms that contain a nucleus and other complex structures in their cells. These organisms appeared about 1 billion years ago
a) ozone
b) cyanobacteria
c) prokaryotes
d) eukaryotes
The time from the formation of Earth 4.6 billion years ago to about 543 million years ago. Life on Earth began during this time
a) Paleozoic era
b) Precambrian time
c) Cenozoic era
d) Holocene epoch
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