trilobite necklace | silver gold_plated all share descent from a

all share descent from a common ancestor

red blood cells ring | sterling silver

a clinical board pass in oncology

people drawn to anatomy through its history rather than its illnesses

trilobite necklace | silver gold_plated all share descent from aTrilobite necklace sterling silver Trilobites owned the oceans for 270 million years. From the Cambrian explosion (~521 Ma) until the Permian extinction (252 Ma), these three lobed arthropods diversified into 20,000 species and left fossils on every continent. Their compound eyes were calcite crystal lenses, the only biological mineral optics known. The Anatomy of the Trilobite Trilobites were marine arthropods with three distinct body lobes: a