You mean to say bacteria of all species or is it transformational changes keeep going on and mammals came our and the lucky one started to talk & think this is earth. And if something happened 4 billion years ago why cant it happened again. Same water / Same Land still no new species coming out naturally. Evolution is ongoing & diseases on certains species stop it reproduction & life comes to an end. But still somehow bacteria keep growing but there is not transformation what its lacking to get transfrom into new Species....