A living cell needs
A. an energy source.
B. a way of releasing energy.
C. both of these
D. none of the above
Answer: C
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Which of the following statements explains why air molecules selectively scatter visible light?
A. Air molecules are much larger than the wavelength of visible light. B. Air molecules are smaller than the wavelength of visible light. C. The electrons that orbit around the nucleus of atoms have a blue colour. D. Air molecules are the same size as the wavelength of visible light.
The Cenozoic Era has been 66 million years long. This is only ____________________ percent of all geologic time. (Use one decimal point in your answer.)
Fill in the blank(s) with correct word
Factors influencing the weathering process include
A) rock composition and structure B) the amount of vegetation in an area. C) the climate of an area. D) rock composition and structure, climate, and vegetation. E) only the climate of an area and rock composition.
What type of weathering agents are lichen considered?
A. mechanical B. chemical C. oxidation D. hydrolysis E. biological