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INVERTEBRATES (ECHINODERMS (VITAL FUNCTIONS (REPRODUCTION (THEY VALE…
INVERTEBRATES
ECHINODERMS
This group are aquatics and marines , they live in the sea bed and some fixed to substrate
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they have an internal skeleton (under the skin) and its called dermal skeleton and usually have spines too
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MOLLUSCS
CHARACTERISTICS
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the body is covered by a thick membrane , THE MANTLE
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