Study the graph about the negative effects of indoor air pollution.

i would say b probably

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.        

the chart shows a production possibilities schedule for sabrina’s soccer.

the schedule shows the - combination-   of goods the business can produce.

for edgenuit.