sentences:  The British anatomist Richard Owen was the first to identify the fundamental difference between analogies and homologies.In biochemistry, physical and chemical constraints on mechanisms have caused some active site arrangements such as the catalytic triad to evolve independently in separate enzyme superfamilies.In his 1989 book "Wonderful Life", Stephen Jay Gould argued that if one could "rewind the tape of life [and] the same conditions were encountered again, evolution could take a very different course".