Living things include all organisms who are alive or were once alive. Nonliving things are not alive and have never been alive (2.5 a).
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Organisms have needs and life processes, which distinguish them from nonliving objects (K.6 b).
Animals can be classified based on characteristics (1.5 c).
A dichotomous key is a tool used to classify organisms based on physical characteristics (4.3 d).
Plants can be classified by their characteristics (1.4 c).
The term living is used to describe anything that is or has ever been alive (e.g., dog, flower, seed, log). The term nonliving is used to describe anything that is not now nor has ever been alive (e.g., rock, mountain, glass) (K.6 a).