Aparked car with its windows closed in the sunlight would be similar to
a.) global cooling
b.) pollution
c.) the greenhouse effect
d.) the ozone layer

the number of senators, and representatives, the state has in congress.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.