Evolutionists estimate that it took about one billion years for the first unicellular organism to mutate into some kind of multicellular organism with different cells, or specialized cells.
(the first unicellular organism; to mutate; into some kind of multicellular organism with different cells, or specialized cells) (Evolutionists; estimate; that it took about one billion years for the first unicellular organism to mutate into some kind of multicellular organism with different cells, or specialized cells)
the first unicellular organism Evolutionists
to mutate estimate
into some kind of multicellular organism with different cells, or specialized cells
that it took about one billion years for the first unicellular organism to mutate into some kind of multicellular organism with different cells, or specialized cells