Why are there so many different ways of being alive? Why is there such a huge, apparently limitless variety of organism types, all (so far as we can tell) conforming to the general abstract model of the living state that we advanced in chapter 10? One answer is that organisms inhabit a wide variety of environments. Over the aeons, changes in DNA have led to the emergence of countless different types of organisms, differing enormously in character. Collectively, these organisms have come to inhabit virtually every kind of environment that the Earth can provide.
Euryarchaota (8 known groups)
Crenarchaota-Eocytes 14 known groups)
Alveolates (ciliates etc.) Strameopiles (protozoa)
Other protists (Euglenids)
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