Examples of representing beings-type of symmetry

Question

Mollusc identity card. How molluscs typified according to examples of the representing beings, type of symmetry, basic morphology, coelom and germ layers, respiratory system, digestive system, circulatory system, nervous system, excretory system and types of a reproduction?

Answer 1

i) Examples of the representing beings: sea slugs, snails, oyster, mussels, squids, octopuses.
ii) Basic morphology: soft body, with no or with calcareous shell.
iv) Type of symmetry: bilateral. Germ layers as well as coelom: coelomates, triploblastics.
v) Digestive system: complete. Respiratory system: branchial or, in terrestrial gastropods, lungs.
vi) Circulatory system: open, closed, cephalopods.
vii) Excretory system: nephridia. Nervous system: advanced cephalization in the cephalopods, ganglial.
viii) Types of reproduction: sexual.