Why are there no cabbage heads? I mean, real cabbages heads, ones with brains? Why are there no plants with brains? Or, plants with beating hearts and blood vessels? Or plants with hands or noses or lungs?
Why are there no animals with photosynthesis? Or animals that bear fruit? Or animals that have leaves and limbs?
All plants are so different from all animals is so many ways, that it does make you wonder, if they have common DNA, why not, then, features that are common in some species?
One possible answer? Perhaps all DNA is not passed from progenitors, but is created by pressures in the environment, and then passed along after being created.
I imagine one answer, as to why plants do not have brains, is found when you notice all animals move from one location to another. The very nature of moving about and maneuvering requires intelligence. So, a creature adapting to its environment would need to develop intelligence as it developed the ability to move. This does follow the principle of natural selection.
(Rewritten 3/26/15)
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