It has long taken a leading place in researches of the kind here detailed, and the new contributions to our knowledge of many groups of extinct vertebrate animals are of the usual interest and ...
26d
The 500-million-year-old primitive fish without bones or teeth has surprisingly advanced anatomical features. “Based on the ...
Despite the significant biodiversity of that time, primitive vertebrates had yet to develop bones or cartilage ... of the richest paleontological records for studying the origins of animal life.
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