Classify the structures homologous or analogous, depending on their structure and function

Analogous structures have a different evolutionary ancestries but they have the same function

while homologous structures are the opposite; they have similar ancestries and common traits but maybe not have the same function in an organism

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.