For bacteria to evolve by beneficial mutations one at a time would take much, much longer than three or four billion years, the time that many scientists believe life has existed on earth. ”
એ દરેકમાં ૨૦ જાતના એમિનો ઍસિડ હોય છે જેને એકસાથે ગોઠવીએ તો ઘણી લાંબી હરોળ થાય.