The relationship between the season of the year in which people are born and their subsequent risk of schizophrenia best highlights the role of in this disorder.

This shows how viral infections can play a role. During seasons that have higher levels of viral transmission (winter most especially), the subsequent risks are higher for schizophrenia. This shows that there is a possible correlational link between these infections and a later diagnosis of the disorder.

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.