filamentous growth of a population of unicellular organisms in response to biotic stimulus +
kinesis +
negative regulation of response to biotic stimulus +
negative regulation of response to external stimulus +
pigment accumulation +
polyphenic determination, influence by environmental factors +
positive regulation of response to biotic stimulus +
positive regulation of response to external stimulus +
reflex +
regulation of response to biotic stimulus +
regulation of response to external stimulus +
response to environmental enrichment
response to external biotic stimulus +
Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an external biotic stimulus, an external stimulus caused by, or produced by living things.