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