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Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

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

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Learn about community patterns and the ecological factors influencing these patterns. Revisit some of the ecosystems you..

Principles of Hormonal Control Systems
Principles of Hormonal Control Systems

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

Biological Energy
ATP & ADP – Biological Energy

ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..

Chromosomes X and Y and Sex Determination
Chromosomes X and Y and Sex Determination

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