Twin studies have found that about of the variance in personality traits is due to genetics.

Does manufacturing in the midwest affect the nations economy

Which statement about spreading knowledge of diseases and health around the world is correct?

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.