What does it mean that a hypothesis must be testable?
O
A. The hypothesis must be shown to be true before the experiment.
O
B. The hypothesis must have an experiment that uses math.
O
C. There can only be one experiment that tests the hypothesis.
O
D. It must be possible to observe whether the hypothesis is true.

it must be possible to observe if the hypothesis is true or not

Explanation: because to observe if something happens or not is testing

the function of the protein macromolecule is to move things in and out of the cell and transport other molecules in the body. there are many functions of proteins. they are the basic building blocks of living things and are responsible for the growth and repair of body cells and tissues.

explanation:

the form of energy changes and the total energy increases0l