The definitive difference between speed and velocity is the consideration of . A. variation
B. Direction
C. angles,

Direction, speed is a scalar quantity which has a magnitude but no direction. Velocity is a vector quantity which has a magnitude (size) and direction.

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.

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