UNIT 3. THE ANIMAL KINGDOM. Invertebrates

UNIT 3. THE ANIMAL KINGDOM.

INVERTEBRATES

They don't have backbone. 

ARTHROPODS

It is the biggest group of invertebrates. It is divided into: insects, arachnids, myriapods and crustaceans. 

1. INSECTS

2. ARACHNIDS

3. MYRIAPODS

4. CRUSTACEANS

MOLLUSCS

They don't have an exoeskeleton. It is divided into three groups: gastropods, bivalves and cephalopods.

1. GASTROPODS

2. BIVALVES

3. CEPHALOPODS

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