To what extent has the presence of a true coelom in animals changed over the course of evolution?
the presence or absence of a true coelom appears not to have changed during the course of evolution.
the presence or absence of a true coelom appears to have changed exactly once during the course of evolution.
it is impossible to tell whether the presence or absence of a true coelom has changed during the course of evolution.
the presence or absence of a true coelom appears to have changed multiple times during the course of evolution.
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