early animals

which phyla has no true tissues or organs

porifera

what are choanocytes responsible for in porifera

creating water flow and trapping food

what skeletal materials do porifera use

spicules and spongin

what body plan do cnidarians have

diploblastic

which class of cnidarians includes true jellyfish

scyphozoa

which trait is unique to echinoderms

water vascular system

what type of symmetry do adult echinoderms have

pentaradial

how do echinoderms primarily reproduce

mostly sexual, with external fertilization

what system do echinoderms use for circulation

water vascular system

calcarea

calcium carbonate spicules

hexactinellida

glass spongin with six-point silica spicules

demospongiae

largest group; spongin/ silica

hydrozoa

hydra; both polyp and medusa stages

schyphozoa

true jellyfish; mainly medusa form

anthozoa

corals and sea anemones; only polyp stage

asteroidea

sea stars

echinoidea

sea urchins, sand dollars

holothuroidea

sea cucumbers

name one way porifera reproduce and describe it briefly

asexual (e.g. budding); sexual via gametes

how do cnidarians capture prey

using cnidocytesz with nematocysts to sting and immobilize prey

explain how echinoderms breathe

diffusion through skin gills and tube feet

what type of worm has a complete digestive system with a mouth and anus

roundworm

what do all worms have in common

long, soft bodies

what group includes worms that live in the ocean and have bristles

polychaetes

are leeches a kind of segmented worm

yes

what part of molluscs secretes the shell and forms a cavity for breathing

mantle

which mollusc secretes the shell and forms a cavity for breathing

cephalopods

what do arthropods use for excretion

mapighian tubules

what type of circulatory system do cephalopods have

closed

(T or F) all molluscs have a radula

(False) bivalves don’t have a radula

(T or F) cephalopods are smart and intelligent molluscs

True

crustaceans are mostly aquatic animals

true

whats the difference between gastropods and cephalopods

Gastropods: use a muscular foot, have a single coiled shell, use a radula to scrape food

Cephalopods: use jet propulsion and tentacles, prominent head and tentacles, use tentacles to catch prey