Speed in a given direction is called
a. thrust.
c. mass.
b. velocity.
d. acceleration.

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Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.

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