The shells of some marine snails are highly variable, with some snail shells being solid and others having stripes. Predation by birds is a major source of mortality for the snails. Scientists studying these snails found that while 47 percent of the snail population was striped, 56 percent of the snails eaten by birds were striped. What could scientists conclude about the snails? (3 points) Select one:
a. The shell pattern is due to genetic variation.
b. The shell pattern is due to environmental variation.
c. Solid snails have little advantage.
d. Solid snails will likely disappear from the population over time.