18. Some groups of organisms work together to stay safe or to take down prey. What do we
call this?

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.

we would need to see the picture to answer it

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex