behavior biological_process behaviour single-organism behavior GO:0044709 GO:0044708 Wikipedia:Behavior The internally coordinated responses (actions or inactions) of animals (individuals or groups) to internal or external stimuli, via a mechanism that involves nervous system activity. behavioural response to stimulus behavioral response to stimulus GO:0007610 1. Note that this term is in the subset of terms that should not be used for direct gene product annotation. Instead, select a child term or, if no appropriate child term exists, please request a new term. Direct annotations to this term may be amended during annotation reviews. 2. While a broader definition of behavior encompassing plants and single cell organisms would be justified on the basis of some usage (see PMID:20160973 for discussion), GO uses a tight definition that limits behavior to animals and to responses involving the nervous system, excluding plant responses that GO classifies under development, and responses of unicellular organisms that has general classifications for covering the responses of cells in multicellular organisms (e.g. cell chemotaxis). GO:0023032 multicellular organismal process developmental process