Q. How many features are correct for arthropoda.
(a) Chitinous exoskeleton.
(b) Gills, book gills, book lungs, tracheal
system for respiration.
(c) Closed circulatory system.
(d) Metameric segmentation.
(e) Statocyst present.
(f) Mostly Monoecious

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Solution:

Correct answer is (b) 4