Helicoid

In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

Homeostasis is the relatively stable conditions of the internal environment that result from compensatory regulatory res..

Obtaining air outside an aquatic environment required species to acquire suitable adaptations, and this was the case of ..

Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..

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

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

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