Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: 40 m/s north of the following represents the velocity of a moving object.
[A]: Which of the following represents the velocity of a moving object?


[Q]: The sun and the moon appear to be about the same size in the sky because the moon is smaller in diameter and is closer to earth than the sun.
[A]: Which statement best explains why the Sun and the Moon appear to be about the same size in the sky?


[Q]: Frogs and toads eating flies event is the best example of competition between species in a pond environment.
[A]:
Which event is the best example of competition between species in a pond environment?