Embryos have development stages that correspond to phylogenetic-evolution stages {recapitulation, development} {ontogeny recapitulates phylogeny}. First embryo stage corresponds to simple and ancient ancestor. Following embryo stages are later and more-complex ancestors. Last stage is current species.
Individual development {ontogeny}| continues from conception to death and includes structure, function, and behavior changes. Genes and development processes determine growth, form, and behavior.
Species begin with simple and ancient ancestor species and evolve to become more-complex species {phylogeny}|.
Embryonic development follows taxonomy and reflects organism evolution recorded in fossils {threefold parallelism}>: development, taxonomy, and fossil record.
4-Zoology-Development-Processes
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Date Modified: 2022.0225