AP Biology· difficulty 1/5
According to the principle of superposition, which group of fossils is the OLDEST?
Dinosaurs (Layer 2)
Mammals (Layer 1)
Amphibians (Layer 3)
Trilobites (Layer 5)
Explanation
In an undisturbed sequence of sedimentary rock, lower layers were deposited first. Therefore the deepest layer (Layer 5, trilobites) contains the oldest fossils.
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