But for every similar shaped organism, there exist as many, if not more dissimilar ones, either alive or preceding. Convergence is not a given, and for every instance of convergence there are just as many divergences, even when appearing similar on the surface. For each degree of software 'carcinization' [1], I'd contend there are as many evolutionary offshoots going against the grain.

[1]: https://en.m.wikipedia.org/wiki/Carcinisation