Assertion: horseshoe crab | /r/HasProperty | 200 million years of existence
Facets:
Source sentences:
text: Elizabeth A. Walls, while a graduate student in fisheries and wildlife sciences; Jim Berkson, assistant professor in fisheries and wildlife sciences; and Stephen A. Smith, professor in biomedical sciences; reviewed the general biology, ecology, and life history of the horseshoe crab in the article "The Horseshoe Crab, Limulus polyphemus: 200 Million Years of Existence, 100 Years of Study.
text: The horseshoe crab, Limulus polyphemus: 200 million years of existence, 100 years of study.