Excretion

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Excretion is the removal of waste products and nitrogenous by-products by metabolism[1]. In vertebrate animals, this process is mainly carried out by the lungs, skin and the kidneys[2].

References

  1. ↑ Britannicacom. 1. Encyclopedia Britannica. [Online]. Available from: https://www.britannica.com/science/excretion [Accessed 5 December 2016].
  2. ↑ Wikipediaorg. 1. Wikipediaorg. [Online]. Available from: https://en.wikipedia.org/wiki/Excretion [Accessed 5 December 2016]
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