write the general characters of phylum porifera arthropoda annelida mollusca
Answers
Answer:
PORIFERA:
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*They are generally marine aquatic organisms, with a few freshwater species.
*Their bodies are asymmetrical.
*Body shape can be cylindrical, vase-like, rounded or sac-like.
*They are diploblastic animals with two layers, the outer dermal layer and the inner gastral layer.
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ARTHROPODA:
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*Exoskeleton. Arthropods are invertebrates, which means their bodies do not have internal bones for support.
*Segmented Bodies.
*Arthropods have bodies that are internally and externally segmented.
*Jointed Appendages.
*Bilateral Symmetry.
*Open Circulatory System.
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MOLLUSCA:
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Unsegmented soft body with bilateral symmetry.
Presence of an internal or external shell.
A toothed tongue (made mostly of chitin) called the radula.
A mantle which is a fold in the body wall that lines the shell.
Muscular foot (and/or tentacles in some).
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