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Which of these is the best explanation of how a smooth round stone became smooth?
A. continuous freezing and thawing
B. volcanic action
C. it fell off the side of a cliff
D. it was in a stream for a long time - ANSWERSD. it was in a stream for a long time
When a lobster grows a claw to replace one that was lost, the process is called
A. restoration
B. retraction
C. regeneration
D. reproduction - ANSWERSC. regeneration
Any astronomical body that revolves around a larger body is called
A. a nova
B. a comet
C. a satellite
D. an astroid
E. a meteoroid - ANSWERSC. a satellite
In chemistry, to be classified as an organic substance must contain
A. sugar molecules
B. sodium atoms
C. carbon atoms
D. water molecules - ANSWERSC. carbon atoms
When scientists measure a liquid's resistance to flow, they are measuring he liquid's
A. density
B. solubility
C. viscosity
D. permeability - ANSWERSC. viscosity
Regeneration in man is limited to
A. reproduction
B. fertilization