According to current scientific thinking,true multicellular organisms
A) descend from several different kinds of unicellular protists,which became multicellular through specialization and cooperation among cells within a colony.
B) cannot be traced to any existing or fossil intermediate stages; thus,there is no current scientific theory for the process that generated multicellular organisms from unicellular ancestors.
C) formed through the fusion of several separate species of unicellular protists,who carried out different complementary functions within the evolving organism.
D) are all descended from a single colonial protist ancestor.
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