What are invertebrates?
invertebrates are organisms without backbone.
name the two simplest invertebrates
porifera and cnidaria
Name the three groupds of cnidaria
jellyfish, coral, sea anemones
name the three groups of worms
annelids, nematodes and platyhelminthes
squids, mussels, oysters, slugs and snails are classfied as
molluscs
name the division of a mollusc's body
head, body masss, muscular foot
how many groups does molluscs have?
three
name the bady parts of arthropods
head, thorax and abdomen
what is an exoskeleton?
external skeleton
