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How many cells did the first living things, prokaryotes, have?
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
The most recent geologic era, beginning 65 million years ago; also called the Age of Mammals
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
Unlike the atmosphere today, the atmosphere 3.5 billion years ago did not contain
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
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
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
Before an ozone layer formed and reduced the radiation reaching the Earth’s surface, most life existed
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
What are the best-known reptiles of the Mesozoic era?
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
living things that first made food from sunlight
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
A billion years after Earth formed, what kind of living things appeared?
Cenozoic era
one
dinosaurs
in oceans and underground.
cyanobacteria
Precambrian time
smaller, less complex
ozone.
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