
Phosphorus and Fossils Flashcard
Flashcard
•
Science
•
8th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a trace fossil?
Back
A trace fossil is a type of fossil that shows the activity of an organism, such as footprints, burrows, or feces.
2.
FLASHCARD QUESTION
Front
What is natural selection?
Back
Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.
3.
FLASHCARD QUESTION
Front
What is artificial selection?
Back
Artificial selection is the intentional breeding of organisms by humans for specific traits.
4.
FLASHCARD QUESTION
Front
What is carbon-14 dating?
Back
Carbon-14 dating is a method used to determine the age of an object containing organic material by measuring the amount of carbon-14 it contains.
5.
FLASHCARD QUESTION
Front
What is the half-life of a radioactive substance?
Back
The half-life is the time required for half of the radioactive atoms in a sample to decay.
6.
FLASHCARD QUESTION
Front
What are index fossils?
Back
Index fossils are fossils that are widespread and help identify specific time periods in Earth's history.
7.
FLASHCARD QUESTION
Front
Why are index fossils important?
Back
Index fossils are important because they help geologists and paleontologists date rock layers and understand the timeline of Earth's history.
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