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Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..

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Still Water Animals

Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

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Control of Growth & Development tutorials look at how the genetic makeup determines the biological processes on a da..

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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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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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DNA Structure & DNA Replication

DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..