The organisms shown in the figure are lophotrochozoans.
The lophophore is thought to have either evolved independently at least twice, or it is an ancestral feature and has been lost in many groups.Based on the figure, propose an argument as to which of these two statements is correct.
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Q99: Although _ resemble mollusks superficially, they possess
Q100: Many lophotrochozoans have a type of free-living
Q101: One chelicerate group, the _, consists of
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