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A multicellular organism is comprised of many cells which have varying degrees of specialization and individualization as the life forms reach higher levels of complexity. Some cells become efficient at one particular ta... More »

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Two of the main advantages of being a unicellular organism as opposed to a multicellular organism are the ability to reproduce asexually and the lack of need for a complicated organ system, in which many things can go wr... More »

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The defining characteristic of multicellular organisms is the possession of more than one cell. In order for a multicellular organism to function, its constituent cells must be capable of identifying and attaching to one... More »

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A non-living organism is defined as an organism that lacks, or has stopped showing, signs of life. Non-living organisms are inanimate and have stopped displaying capabilities for growth, reproduction, respiration, metabo... More »

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A unicellular organism is any life form that is composed of a single cell; they live and carry out all life processes as a single cell. Based on their complexity, unicellular organisms can be placed in one of two categor... More »

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A heterotroph is any organism, including carnivores, omnivores and herbivores, that cannot produce its own food through solar energy and must feed off another life form. In the food chain, heterotrophs represent the cons... More »

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It is believed that the first organisms to appear on Earth resembled singled-celled life forms known as Archaea, which are similar to bacteria but lack nuclei. Modern-day Archaea can live in extreme environments such as ... More »

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