Scientists have been able to date objects from nearly the formation of the Earth using:
A) homologous features. B) comparative morphology.
C) radiometric dating. D) genetic clocks.
Answer: C
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In multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results. How does this disease manifest at the level of the action potential?
I) Action potentials move in the opposite direction on the axon. II) Action potentials move more slowly along the axon. III) No action potentials are transmitted. A) only I B) only II C) only III D) only II and III E) only I and II
Most microbes that inhabit estuaries are ________.
A. halovariable B. halophobic C. halophilic D. halotolerant
Which of the following is a reactant used in the light-dependent reactions?
a. carbon dioxide b. glucose c. oxygen d. water
Which of the following is the best definition of antagonism?
A. competition for limited resources B. cooperation in utilization of resources C. sharing the same environment without harming each other D. production of products that interfere with the growth of others E. competition and production of products that interfere with growth