Assertion: human embryo | /r/CapableOf | start like -celled sea organism
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text: His claim was that the human embryo started like a single-celled sea organism, then it developed into a worm with a tube shaped heart that pulsated, then into a gilled fish with a two-chambered heart, then into an amphibian with a three-chambered heart, then into a mammal with a four-chambered heart and a tail, and finally into a human baby 4.