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?

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

Answer 1

The answer is B i just did the Assignment

Answer 2

The right answer is B. It is a reference point. Because it will let you measure the distance made which is the lenght from the starting point to the current point of position of the life form.