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Fossilized evidence of Earth’s first forms of life would consist of
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
Which of the following was NOT characteristic of Earth before the oceans formed?
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
The length of time required for half of the radioactive atoms in a sample to decay is its
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
The endosymbiont theory proposes that eukaryotic cells arose from
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
The process by which two species, for example, a flower and a pollinating insect, evolve in response to each other is called
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
What does fossil evidence indicate about the order in which these three vertebrates evolved: a bony fish with a jaw, a jawless fish, and a fish with leglike fins?
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
To formulate a hypothesis about how Earth’s elements were rearranged after melting, scientists considered which physical principle?
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
A pattern in which species experience long, stable periods interrupted by brief periods of rapid evolutionary change is called
an atmosphere containing oxygen gas
The fish with leglike fins was the last to evolve.
Less dense materials tended to float on denser materials.
half-life
punctuated equilibrium
communities formed by prokaryotes
coevolution
prokaryotes from the Precambrian
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