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Energy, Hydrology, Microbiology › ViewFossil fuels are considered nonrenewable resources because of _______ .
A. their easy access
B. inexpensiveness
C. combustion
D. how long they take to form
Neurons › View
Made of a fatty substance that insulates and prevents the electrical current from leaving the axon.
A. myelin sheath
B. dendrite
C. axon
D. Node of Ranvier