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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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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

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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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Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..

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