A. Man B. Bird C. Frog D. Earthworm
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A. Narrow lumen B. Valves to control direction of flow of blood towards the heart C. Strong muscular walls D. Valves to control direction of flow of blood opposite to the heart
A. Eustrachian valves B. Mitral valves C. Auricular appendix D. Fossa avalis
A. Respiration B. Excretion C. Digestion D. Nutrition
A. Urea B. Ammonia C. Hippuric acid D. Uric acid
A. Pharyngeal B. Integumentary C. Septal D. Meganephridia
A. White muscle B. Red muscle C. Both D. None
A. Cerebrum B. Corpus callosum C. Medulla oblongata D. Cerebellum
A. Epinephrine B. GABA C. Acetylcholine D. Histamine