The independent variable:
o
a. is the one that the experimenter manipulates directly.
o
o
o
b. tells you what happens in the experiment.
c. is not present in all experiments.
d. is what happens to the experimental group.

A. Is the one that the experimenter manipulates directly

Explanation:

The independent variable is the one that is manipulated during an experiment by the experimenter.

The dependent variable is the one that is effected by the independent variable in an experiment.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper