tropo-, trop-, -tropal, -trope(s), -tropic, -tropism, -tropia, -tropous, -tropy, trep-

In biology, dwelling in a climate that alternates between sunny drought and torrential rain.

The lowest and most dense layer of the atmosphere, extending 10 to 20 kilometers (6 to 12 miles), within which temperature decreases with rising altitude and where most nearly all cloud formations occur and weather conditions manifest themselves.

Most clouds and weather systems occur in the troposphere.

Descriptive of the lowest and densest part of the earth's atmosphere in which most weather changes occur and temperature generally decreases rapidly with altitude and which extends from the earth's surface to the bottom of the stratosphere.

1. The movement of an organism toward or away from a stimulus as a result of comparing sensory input received from paired receptors on both sides of the body.
2. The movement or orientation of an organism in response to two stimuli, especially lights, by means of different sense organs.
3. The movement or orientation of an organism in response to the difference in stimulation of two symmetrically placed receptors.