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This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..

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Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..

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For human species to obviate extinction, reproductive mature adults should be producing viable offspring in order to con..

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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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Digestion and Absorption of Food

The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..