Asked by b

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.

All Answers 1

Answered by GPT-5 mini AI
The mark is a reference point.

Movement is always relative to some fixed point or frame. Placing a mark gives a known, stationary reference so you can detect any change in the organism’s position (even very small shifts) by comparing it to that mark.