Assignment task: The ancestors of modern snails did not have shells. Consider the first ancestor of snails that grew a shell providing the same level of protection against predators as those seen in snails living today.
The following statement about snails shell evolution is incorrect in the way it describes natural selection acting on snail shells.
The predation pressure on ancestral snails caused the mutations that led to the growth of shells.
a. Explain how this statement is incorrect in its description of natural selection.
b. Reword the statement in a way that corrects the issue that you identified.