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OpenStudy (awkwardpanda):

17. Which system in figure 18-2, A or B, provides information about the evolution of the three animals?

OpenStudy (awkwardpanda):

OpenStudy (awkwardpanda):

18. According to the cladogram in Figure 18-2, what to characteristics do crabs and barnacles share that limpets do not?

OpenStudy (anonymous):

17. B 18. From Tree B we can see that all the organisms have tiny free-swimming larva, but only crabs and barnacles have a molted external skeleton and segmentation.

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