Journal Article EVOLUTION OF THE METAZOAN LIFE CYCLE Get access Joel W. Hedgpeth Joel W. Hedgpeth Pacific Marine Station Dillon Beach Calif Search for other works by this author on: Oxford Academic Google Scholar Evolution, Volume 28, Issue 4, 1 December 1974, Page 696, https://doi.org/10.1111/j.1558-5646.1974.tb00804.x Published: 01 December 1974 Article history Received: 01 June 1974 Published: 01 December 1974
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Joel W. Hedgpeth (1974) studied this question.