If you know the personality of an identical twin, you can expect the personality of the other twin to be

Helen goes to her doctor to take a vision test. The test indicates she sees no colors at all. She sees everything in shades of lights and darks. This makes her ______

a. a monochromat c. a trichromat b. a dichromat d. legally blind

Organ development is most open to exposure from teratogens during the embryonic and fetal

periods. Therefore, these can be called ___________________ periods for teratogen exposure. a. gestational b. sensitive c. critical d. harmful