Question

Some life forms move so slowly that their movement cannot be detected by normal observation. The best way to determine any movement is by placing a mark at some point, and observing any change in position from it. Why is this true?

The life form returns to that mark.
The mark is a reference point.
The mark is a standard unit.
The mark makes measuring convenient.

Answer 1

[AI-generated answer — Bot GPT 3.5]

The mark serves as a reference point because it allows for easy comparison of the position of the life form at different points in time. Without a reference point, it would be difficult to determine if any movement has occurred at all. By using a mark as a point of reference, any change in position can be easily observed and measured.