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all the parts parts of the planet that are inhabited by living things; sum of all Earth's ecosystems


community of living things plus the non-living features of the environment that support them


all the organisms living in an area


group of individuals of the same species living in a particular area at the same time


living thing

organ system

unit of multiple organs that together perform a vital body function


unit consisting of several systems that togeether performa a specific task


cooperating unit of many similar cells that perform a specific function


basic unit of livign matter

smallest to largest

cell, tissue, organ, organ system, organism, population, ecosystem, biosphere

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