The preferred ratio of hours of light to darkness for MOST lab animals is?Select one alternative:12:1214:1010:148:16

There are equal hours of daylight and darkness during a(n)

The least circadian disruption is expected for those who work regular shifts from:Group of answer choices14:00 to 22:0008:00 to 16:004:00 to 12:0020:00 to 4:00

An investigator keeps her mice in a room with LD12:12 with lights on at 6 am.  She wants to change the lights to a skeleton photoperiod (1 h pulses) without changing the animals' entrainment.  What schedule would accomplish her goal?

Which of these gets so bright as to be seen in daylight at times?Group of answer choicesMercurySaturnMarsJupiterVenus

If a pilot whose eyes have fully adapted to darkness is exposed to a bright flash of light, the time required for dark adaptation to be re-established is most likely to be