Your math professor is concerned about the visible confusion on student faces as she attempts to explain a difficult statistical problem. This situation illustrates how it's often difficult to distinguish the sender from the receiver of a message, making a better term for these roles.

Ithink it's a, but i might be wrong

How either some or all of the organisms in this activity are related to one another based

Many citizens are in danger of contracting a food-borne illness.more people are living with chronic illnesses.pathogens are becoming stronger and harder to defeat.

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.