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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..

This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

Regulation of Biological Systems tutorials are focused on the modulation of biological systems from cell to population l..

Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..

The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..

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