Multiple choice

The pigment haemocyanin is found in

  1. mollusca

  2. echinodermata

  3. chordate

  4. annelida
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A Correct answer
Explanation

Haemocyanin is a copper-based respiratory pigment found primarily in molluscs (such as snails, octopus, and clams) and some arthropods. Unlike haemoglobin (iron-based in vertebrates), haemocyanin is blue when oxygenated and colorless when deoxygenated.

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