Researchers wanted to see if adults were actually afraid of the dark by exposing them to different levels of light in a room while measuring their heart rates. in this experiment, what are the different levels of light?
a) the dependent variable
b) the independent variable
c) the control group
d) the experimental group

a) Dependent variable.

Explanation:

In a experiment you need to set two variables: Dependent and independent.

Dependent variable is the one you are going to manipulate to study its effects in the independent variable.

You don't manipulate independent variable in an experiment, because it doesn't get you anywhere.

abolish

do away with

unanimous

in complete agreement

secede

separate; break free

inauguration

starting a new position with a formal ceremony.

cooperationist

people who wanted the north to cooperate with the south

surrender

to give up

volunteer

perform a service for free

draft

involuntary service in military

retreat

withdraw; move away from enemy

advisor

expert who gives advice

explanation: