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Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

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This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..

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

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Growth and Plant Hormones

Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

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Human Reproduction

Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..