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There are more species of insects than any other species combined. This surely illustrates that insects have the selecti..

Control of body movement
Control of Body Movement

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

Principles of Hormonal Control Systems
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Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..

Hormone Production
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Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..

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Fish

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

Lights' Effect on Growth
Lights’ Effect on Growth

This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..