Which change to the system would cause the freely-moving piston to lower? a) apply heat to the gas particles. b) reduce the atmospheric pressure. c) place the system in an ice bath. d) add more gas molecules to the system.

Place the system in an ice bath.. This would cool the particles and cause them to slow down. Then, they would exert less pressure, and the piston would fall.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.