Answer: D. Cancer
Cancer is when cells grow at an abnormal and uncontrolled rate.
1. constant speed is a steady speed from start to finish, instantaneous is not constant from start to finish.
2. The average speed of the marble is 5 m/s (meters per second).
3. Rider 1 will arrive at the destination before Rider 2.
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A person that studies rocks minerals and earth's land forms are geologist
