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