Assertion: turtle embryo | /r/HasProperty | presented by haeckel
Facets:
value: in 1868
type: TEMPORAL
Source sentences:
text: Illustrations of dog and human embryos, looking almost identical at 4 weeks then differing at 6 weeks, shown above a 6-week turtle embryo and 8-day hen embryo, presented by Haeckel in 1868 as convincing proof of evolution.