Paleontology. Fossil embryos hint at early start for complex development.
Unger
Katherine
K
D000818:Animals; D000845:Annelida / Q000196:embryology; D002681:China; D004625:Embryo, Nonmammalian / Q000033:anatomy & histology* / Q000166:cytology; D047108:Embryonic Development; D005580:Fossils; D019015:Geologic Sediments; D007448:Invertebrates / Q000196:embryology*; D008974:Mollusca / Q000196:embryology