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A: In frog, sinus-venosus is present. R: In mammals and birds are remnant of sinus venosus has taken part in the formation of SA node.
(a) Name the red pigment which carries oxygen in the blood (b) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds ? (c) How many chambers are there in the heart of : (i) an amphibian, (ii) a mammals, and (ii) a fish ? (d) Describe the circulatory system in a fish.
DINESH PUBLICATION-EVIDENCES OF EVOLUTION-CHECK YOUR GRASP
