When light shines on a plant from one side, the moves to the shaded side of the stem where is causes change in growth. * A. auxin B. gibberllin C. cytokinins D. abscisic acid

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Why are common names a problem for scientist?