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Why do scientists study fossils?
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
What is a fossil?
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
What does the geologic time scale represent?
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
How can the relative age of fossils and rock layers be determined?
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
What parts of organisms are most likely to become fossilized?
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
What do scientists think the first life form was?
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
Fossils can show how the earth\'s __________has changed over time.
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
The Law of Superposition states:
What area of the world the rock layer is found in.
Blue-green bacteria
The theorized development of life on earth dating back 4.6 billion years ago
Teeth
Mountain ranges
The remains or traces of an organism that lived long ago.
Both a and b
The length of time it takes for one-half of the radioactive element to change into a stable element.
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