What is a metazoan? give some examples?

Answer 1

Cnidaria (corals, jellyfish, Hydra)
Conulariida

Ctenophora (comb jellies)

DEUTEROSTOMIA (deuterostomes)
---Echinodermata (starfish, sea urchins, sea cucumbers, etc.)
---Hemichordata (acorn worms, graptolites)
---Chordata

Cephalochordata (lancelets)
Myxini (hagfish)
Urochordata (tunicates, sea squirts)
VERTEBRATA (Vertebrates)
ECDYSOZOA (molting animals)
---Arthropoda (crabs, spiders, insects, etc.)

Anomalocarida
Cheliceramorpha (chelicerates & kin)
Crustaceamorpha (crustaceans)
Pycnogonida (sea spiders)
Trilobita (trilobites)
Uniramia (insects & kin)
---Cephaloryncha (kinorhynchs & priapulids)
---Nematoda (roundworms)
---Nematomorpha (horsehair worms)
---Onychophora (velvet worms)
---Tardigrada (water bears)
LOPHOTROCHOZOA (worms, molluscs, & lophophorates)
---Annelida (segmented worms)
---Brachiopoda (lamp shells)
---Bryozoa ("moss animals")
---Echiura (spoon worms)
---Entoprocta
---Mollusca (snails, clams, squid, etc.)
---Nemertini (ribbon worms)
---Phoronida (horseshoe worms)
---Pogonophora (bearded tube worms)
---Sipuncula (peanut worms)

Placozoa (the most simple animals known)

Platyhelminthes (flatworms)

Porifera (sponges)

Rotifera (rotifers) & Acanthocephala

Vendian Animals (the First animals)
Hope this helps you get that A+ on your homework.

Answer 2

Metazoa are multi-cellular animals that digest food.
The previous answer gave excellent examples.