Communities make up a major component of an ecosystem

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.

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle