Which of these reduces friction?
A. car brakes
B. tire tread
C. ball bearings
D. sandpaper
C. ball bearings
If you place bean seeds between moist paper towels and watch
the stem and leaves appear, you will see a demonstration of
A. transpiration
, B. germination
C. fertilization
D. pollination
B. germination
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Any astronomical body that revolves around a larger body is
called
A. a nova
B. a comet
C. a satellite
D. an asteroid