Integumentary System ☺
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Annelida
Porifera
Cnidaria
Mollusca
Platyhelminthes
Nematoda
Arthropoda
Echinodermata
Chordata
ECHinodermata
Echinodermata have a mesodermal skeleton made of calcareous plates. Their integumentary system also consists of cells that secrete sticky materials and/or toxic fluids. Skin pigments can change colors to allow it to easily hide from predators.