What is one use for x-rays?
a. sterilizing
b. cancer treatment
c. airport securit...
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How does the molecular clock work? a. it analyzes the brain functionality of two different species.b. it examines and compares the physical characteristics of two different species.c. it illustrates relationships between two different species.d. it compares the number of mutations that exist in the dna of two different species.
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Apopulation of black bears depends on salmon from a stream for food. if a drought causes the stream to run dry one year, how will this likely impact the black bear population?
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How do you date a sample of rock that you suspect as being one of the earliest on earth
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