Adult tunicates urochordates) lack notochords. However, larval urochordates have them and use them to
A) induce tissue differentiation; in adults, tissue is already differentiated.
B) aid in swimming; adults are sessile and thus no longer propel themselves.
C) stiffen their bodies; in adults, the notochord is replaced by a column of bone.
D) organize their nervous systems; adults' nervous systems are fully developed and do not change.
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