The range of habitats

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.

Ancestral line

Eukarya

Proteobacteria

  • Spirochaetes
  • Chlamidia/verrucomicrobia Cyanobacteria
  • At least 12 other major groups

Euryarchaota (8 known groups)

Crenarchaota-Eocytes 14 known groups)

Fungi

Collar-flagellates

Alveolates (ciliates etc.) Strameopiles (protozoa)

Rhodophyta

Other protists (Euglenids)

Bacteria

Archaea

Korarchaota

Protists

'-Animals

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