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

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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

"Cronopio dentiacutus", a prehistoric mammal (an illustration)
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Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..

Freshwater Ecology
Freshwater Ecology

Freshwater ecology focuses on the relations of aquatic organisms to their freshwater habitats. There are two forms of co..

Consciousness and behavior
Consciousness and Behavior

Human consciousness and behavior are an interesting topic since they are determined and controlled by the brain. Conscio..

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Biological Cell Introduction

It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..