Circadian rhythms can best be described as heartbeats that trigger a change in blood circulation. the regulation of biological cycles into regular, daily patterns. the time between sunrise and sunset, which determines sleep patterns. the changes that occur in wakefulness after jet lag and shift work.

Plants transfer carbon in the carbon cycle a. through assimilation of carbon from the soil. b. when carbon transpires from their stomatae. c. when they are eaten by animals. d. through fixation of carbon in the soil.plants transfer carbon in the carbon cycle a. through assimilation of carbon from the soil. b. when carbon transpires from their stomatae. c. when they are eaten by animals. d. through fixation of carbon in the soil.