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

Adaptive Radiation
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The diversification of several new species from a recent ancestral source, each adapted to utilize or occupy a vacant ad..

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Kidneys and Regulation of Water and Inorganic Ions

The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..

Gene Regulation in Eukaryotes
Gene Regulation in Eukaryotes

Learn about the general structure of a eukaryotic gene, the transcription factors, and post-transcriptional regulation....

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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

Homeostasis by water regulation
Homeostasis of Organism Water Regulation

Osmoregulation is the regulation of water concentrations in the bloodstream, effectively controlling the amount of water..