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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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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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While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

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Cell respiration is the process of creating ATP. It is "respiration" because it utilizes oxygen. Know the different stag..

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Indicator Species and Endangered Species

Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..