Question

what characteristic is necessary for a hypothesis to be useful in a scientific investigation?
o it must be testable.
o it must be proven.
o it must be true.
o it must happen in a lab.

Explanation:

A hypothesis in a scientific investigation needs to be testable so that experiments or observations can be designed to support or refute it. It doesn't have to be proven or true at the start, and it doesn't necessarily have to occur in a lab.

Answer:

It must be testable.