Quiz 1 Flashcards
what type of body symmetry do flatworms (Platyhelminthes) exhibit?
bilateral symmetry
in which type of body cavity do organs lie freely in the space, surrounded by mesoderm-derived tissues
coelom
which germ layer is responsible for forming the muscles and circulatory system in triploblastic invertebrates
mesoderm
which type of body symmetry is common in invertebrates like jellyfish
radial symmetry
what is the main role of coelom in animals that possess it
- provides support
- allows for internal organ development
which invertebrate group has both aquatic and terrestrial species
arthropoda
which is NOT a characteristic of invertebrates
possession of a vertebral column
which is common in many invertebrate phyla
exoskeleton in some groups
what defines an invertebrate
animals without backbone
which phylum contains the most species of invertebrates
arthropoda
which is a characteristic of radial symmetry
body parts are arranged around a central axis
in invertebrates with bilateral symmetry, what is the term for the development of a distinct head region with sensory structures
cephalization
which of the following invertebrate groups lack true tissues
Poriferans
what percentage of all animal species are invertebrates
95%
which phly exhibits a segmented body plan
annelida
