entify the invertebrates described in each number 1. They are soft-bodied flatworms. 2. They have no backbone, instead, they are composed of spiny speckles which serve as skeleton, 3. They are soft-bodied animals with hard external shell 4. They have hard outer exoskeleton or cuticle and jointed body and limbs. 5. They are equipped with spiny skins and peculiar tube feet