Logan read about snail shells in his science book.

snails make their shells by releasing a liquid that hardens and forms a protective covering. more liquid is released over time, and the shells get larger. some are spiral shaped, and others are cone shaped. these shells protect snails from birds and snakes by sealing the snails away from predators.

which new idea can logan form now that he has read the text and seen the photograph?

snail shells are made from liquid, which might dissolve in wet weather.
predators do not like spiral-shaped objects.
snail shells do not change over time.
snails make their own shells over time, which is why they have a circular or spiral shape.