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Describe how fish Breathe

Mouth opens, Buccal cavity expands and then the opercular cavity expands. Mouth closes, Buccal cavity contracts. Operculum opens and opercular cavity contracts. Operculum closes.

What are the key features of a teuthoid cephlapod

8 arms 2 tentacles siphon eye beak

Describe the circulatory system of a teuthoid cephlapod

3 hearts. 2 Branchial hearts one for each cnetidia and one systemic heart which pumps blood round the rest of the body

What are weisers 4 trophic groups (alpha numeric and descriptive names)

1A Selective Deposit Feeder, 1B Deposit Feeder, 2A Epistrate Feeder, 2B Ominvore/Carnivore

Name the food sources of the different nematodes groups

1A: Bacteria, 1B:D.O.M, 2A: Micro algae & Bacteria, 2B Meta & Proto zoans