part of part of in taxon results in development of embryo development animal organ development embryonic organ development Development, taking place during the embryonic phase, of a tissue or tissues that work together to perform a specific function or functions. Development pertains to the process whose specific outcome is the progression of a structure over time, from its formation to the mature structure. Organs are commonly observed as visibly distinct structures, but may also exist as loosely associated clusters of cells that work together to perform a specific function or functions. GO:0048568 embryonic organogenesis anatomical structure development cellular organisms Bacteria Archaea organ