| A | B |
| construct | a concept requiring a belief in something that connot be seen or touched but that seems to exist |
| consciousness | the organisms awareness of or possibility of knowing what is happening inside or outside itself |
| subconsciousness | consciousness just below our present awareness |
| unconsciousness | thoguth or desires about which we have no direct knowledge |
| biological clocks | internal chemical units that control regular cyclas in parts of the body |
| free-running cycles | cycles set up by biological clocks that are under their own control ignoring the enviroment |
| entrainment | the process of altering the free-running cycle to fit a different rhythm |
| circadian rhythm | sequences of behavioral changes that occur every 24 hours |