Animal-Kingdom-Part-2
Porifera (Sponges):
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Sponges are simple, aquatic animals that lack true tissues and organs.
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They are filter feeders and have a porous body structure.
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Sponges are considered one of the most primitive animal phyla.
Coelenterata (Cnidarians):
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Cnidarians include organisms like jellyfish, corals, and sea anemones.
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They have specialized cells called cnidocytes that contain stinging structures (nematocysts) used for defense and capturing prey.
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Cnidarians exhibit radial symmetry and have a simple body plan.
Ctenophora (Comb Jellies):
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Ctenophores, or comb jellies, are gelatinous marine animals.
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They have eight rows of ciliated combs, which they use for locomotion.
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Ctenophores exhibit radial symmetry and are relatively simple in structure.
Platyhelminthes (Flatworms):
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Flatworms are bilaterally symmetrical animals with three germ layers (triploblastic).
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They include organisms like tapeworms and flukes.
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Flatworms have a simple digestive system and lack a true body cavity (coelom).
Aschelminthes (Roundworms or Nematodes):
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Nematodes are unsegmented, cylindrical worms with a tough cuticle.
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They are bilaterally symmetrical and triploblastic.
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Nematodes are found in various environments and can be free-living or parasitic.
