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

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

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Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..

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The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

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Neural Control Mechanisms

Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

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Biological Viruses

Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...