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chpt 2
the characteristics of life
Term | Definition |
---|---|
an organism | is a living thing |
metabolism | is the sum of all the chemical reactions in an organism |
continuity of life | means that all organisms arise from other living organisms of the same type |
life | is defined as the possession of the following characteristics;organised,requiring nutrition and excretion,capable of response and reproducing |
organisation | means that living things are composed of cells,tissues,organs and organ systems |
nutrition | is the way in which organisms obtain and use their food |
excretion | is the removal of waste products of metabolism from the body |
response | is the way in which all living things react to changes in their environment |
reproduction | is the production of new individuals |
sexual | involves the union of sex cells |
asexual | does not involve the union of sex cells |