As with other taxa-defining novelities, three is no evidence that any fundamental changes have occurred in the basic design of the cell system since its origination. The cell membrane, the basic metabolic paths, the ribosome, the genetic code, etc., are essentially invariant in all life forms on earth. And absolutely no plausible well-developed hypothetical evolutionary sequence has ever been presented showing how the cell night have evolved via a series of simpler cell-like systems. (p. 121)
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