In Figure 25

question 41

Multiple Choice

In figure 25.2,the evolution of nervous systems in vertebrates and invertebrates is shown.Given that humans who eat clams contaminated with saxitoxin develop paralysis,which of the following statements is most likely correct?

• A)Clams and humans have very distinct nervous systems
• B)Clams and humans both have a spinal cord
• C)Na⁺ transporters in clams and humans evolved from a common ancestor
• D)Clams and humans have identical nervous systems
• E)Na⁺ transporters in clams and humans work by separate mechanisms

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