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Bacteria and Parasites

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Submitted By VictorBanks
Words 1075
Pages 5
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Bacteria and Parasites


Victor Banks

Melanie Crow

COM 155


Bacteria and parasites are both specific types of organisms that are able to have affect on a humans body, but parasites have a greater increase in harming a human being rather than a bacteria. While the exact origin of bacteria remains a matter of speculation, it is clear that they are among the oldest and most adaptable organisms on Earth.

Over three and a half billion years ago the earth was an inhospitable planet characterized by a landscape of active volcanoes in an atmosphere with hardly any oxygen, as far as we know the first life forms to be on Earth were simple organisms that closely resembled present day bacteria and did not depend on atmospheric oxygen or survival. Eventually in the shallow waters of primitive earth photosynthetic microorganisms appeared which used the suns energy to make food and omitted oxygen as a waste product as oxygen accumulated in the atmosphere bacteria that depended on this gas gained a foothold and began to flourish. Over several billion years new forms of life evolved many have since become extinct as conditions on earth have changed bacteria however, continued to adapt and thrive when other organisms...

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