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Fossils indicate that some of the first animals to live on land were
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
Before an ozone layer formed and reduced the radiation reaching the Earth’s surface, most life existed
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
A gas in the atmosphere which absorbs harmful radiation from the sun
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
How many cells did the first living things, prokaryotes, have?
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
What are the best-known reptiles of the Mesozoic era?
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
living things that first made food from sunlight
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
gas that cyanobacteria sent into oceans and air
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
What are the four biggest eras in geologic history?
cyanobacteria
ozone
Precambrian, Paleozoic, Mesozoic, and Cenozoic
dinosaurs
one
oxygen
in oceans and underground.
crawling insects.
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