In which animals are well-developed,distinct | vedclass

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(C) The phylum $Arthropoda$ is the first group in the animal kingdom to exhibit well-developed and distinct respiratory organs. These include structur

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Arthropoda

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(C) The phylum $Arthropoda$ is the first group in the animal kingdom to exhibit well-developed and distinct respiratory organs. These include structures such as gills,book gills,book lungs,or the tracheal system,which are specialized for gas exchange in diverse environments. While lower phyla like $Annelida$ rely on cutaneous respiration (skin) and $Mollusca$ have gills,$Arthropoda$ represents the first major evolutionary step toward complex,specialized respiratory systems adapted for both aquatic and terrestrial life.

In which animals are well-developed,distinct respiratory organs first observed?

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