For snail species that evolve larger shells in response to predation (which may or may not include these dogwinkles), what is likely to limit the size of the shells? Use your knowledge of biology and your experience in this experiment to propose a likely reason why shells that evolved to be larger do not continue to evolve to be even larger than the size they currently are. In other words, what might limit the evolution of yet larger shells?

The thing that will likely limit the size of the shells is the limited variability in the size of shells in the initiating population.

It should be noted that the shell size in snail species is determined by a number of variants of the gene and this plays a vital role in the determination of the size of their shell.

The number of variants of the gene encoding for shell size is limited. In a situation whereby there's a predator that targets the snail species with smaller shell size, then evolution would increase the frequency of snails that possess larger shell variants.

Therefore, for snail species that evolve larger shells in response to predation, the limited variability in the size of shells in the initiating population will be a limiting factor.

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The correct answer is: The limited variability in the size of shells in the initiating population.

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