The metric prefix that means one thousand is milli-. Indicate ...

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The metric prefix that means one thousand is milli-.
  Indicate whether the statement is true or false

Question 2

Why are shadows generally not totally black?
 a. Because our eyes cannot see total blackness, so we reinterpret the shadows.
  b. Because of the way the light is focused by the eye.
  c. Because of scattered light from the atmosphere and nearby objects.
  d. Because of the fuzziness of the penumbra.
  e. Because of the fuzziness of the umbra.

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Answer to Question 1

F

Answer to Question 2

c