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Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..

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

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

With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..

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

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

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