Snails cannot change colors.
No. Snail can not detect the colors
No
It depends on the type of species.
Sometimes they are brown. Sometimes they can be a green-ish color too.
no they are colour blind
Snails do not change their shells ever. They keep their shell up to the day they die.
No, snails are probably not aware of climate change. It may be that warmer weather later will cause them problems, but not yet.
they never change their shell and they can be eaten.
yeloow BRAP!
Periphyton , the gross looking stuff in the hot springs
chemical change
Rudolf Kurz has written: 'Looking for snails on a Sunday afternoon'