Spilman,+S.

__ Evolution __ January 19, 2017 An important element about the science of evolution by Charles Darwin, is the concept of natural selection. Natural selection is basic ally when individuals in a species compete with each other for resources. When certain individuals are better adapted to their lifestyle and surroundings, they will have a better chance of surviving and to reproduce. Natural selection helps our understanding of how species change over time.
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//media type="youtube" key="0SCjhI86grU" width="560" height="315" This video includes key concepts about the understanding of Natural Selection and provides you with more details and knowledgeable facts.//
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http://sciencenetlinks.com/lessons/introduction-to-natural-selection/

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The nervous system is many nerves as well as cells that distribute messages to and from the brain and spinal cord. These messages are sent to various parts of the body.
This system consists of the central nervous system and the Peripheral nervous system.

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Sources: https://www.google.ca/search?q=nervous+system&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiDy6-4ptHRAhWCz4MKHRZVCG0Q_AUICCgB&biw=1366&bih=643#imgrc=eD7TxRjg3iVsPM%3A

https://www.google.ca/search?q=nervous+system&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiDy6-4ptHRAhWCz4MKHRZVCG0Q_AUICCgB&biw=1366&bih=643#imgrc=ysFDKE7WNrzwgM%3A