Placing organisms on a tree of life based on morphology seems to
me to be quite arbitrary and unscientific.
We have blue-green algae that are supposed to be about
3.5 billion years old, alive. We put the their genetic structure on
the bottom. We have man, we put their (or some more advanced)
genetic structure on top. We work out what differences in structures
relates to which characteristics in organisms between species, families, kingdoms, classes and phyla. We fill in the
table and find out which traits were picked up by which organisms.
We should be able to tell where all animals and plants , extant, extinct and unknown originated genetically, geographically and temporally.
Edited by LucyTheApe, : grammar