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Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

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Movement of Molecules Across Cell Membranes

Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..

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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..

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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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Genes are expressed through the process of protein synthesis. This elaborate tutorial provides an in-depth review of the..