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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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Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

An artist depiction of a Precambrian multicellular life form.
The Evolution of Cell Organelles

The nucleus containing the genetic material, DNA, and the mitochondria, well-identified as the "powerhouse of the cell",..

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Genetic Information and Protein Synthesis

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

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Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

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IQ, Creativity and Learning

Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..