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Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

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Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...

Ecosystem Succession
Ecosystem Succession

If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..

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Independent Assortment and Crossing Over

This tutorial describes the independent assortment of chromosomes and crossing over as important events in meiosis. Read..

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Indicator Species and Endangered Species

Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..