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Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

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This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

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This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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Freshwater Communities & Lentic Waters

Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..

Non-Mendelian Inheritance
Non-Mendelian Inheritance

In this tutorial, find out more about certain types of inheritance that does not follow the Mendelian inheritance patter..

Genetics – Lesson Outline & Worksheets
Genetics – Lesson Outline & Worksheets

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