The fossil record of the predatory whelk Sinistrofulgur and its bivalve prey Mercenaria suggests that both taxa coevolved over long periods of time
Which of the following—hypothetical—observations would pose the greatest challenge to the hypothesis that both taxa coevolved?
a. Fossil whelks sometimes show broken shells from attempting to eat Mercenaria.
b. There is no correspondence in the way size changes in both species throughout the fossil rec-ord.
c. There are occasional whelk feeding traces on species other than Mercenaria.
d. An innovation in whelk morphology is followed by more evidence of successful whelk feeding on Mercenaria.
B
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