(HOT) UPSC Exam Complete Study Notes 2026
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(i) The Exocrine system consists of glands that secrete chemical messages called hormones.
(A) Hydrostatic skeletons consist of fluid filled closed chambers.
(A) In living organisms there are two types of cellular organisation.
(A) Coelenterates, cnidarians & Echinoderms have their neurons organised into a nerve net.
NEW! UPSC Exam Complete Study Notes (PDF Available)