'(Sofia of the Clue Crew reports from the Field Museum in Chicago)  Snail shells are in a pattern usually called this; they add new coils as the snail ages'
spiral
SCIENCE & NATURE: Snail shells are in a pattern usually called this; they add new coils as the snail ages
Snail shells are in a pattern usually called this; they add new coils as the snail ages
Snail shells are in a pattern usually called this; they add new coils as the snail ages
SCIENCE & NATURE
spiral
SCIENCE & NATURE