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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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Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and developme..

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

Cell Biology
Cell Biology

The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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Protein Activity and Cellular Metabolism

Proteins have a crucial role in various biological activities. Get to know how proteins are able to perform as enzymes, ..

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