ANSWERS:
(a) The two ventricles together in humans
(b) The heart that contracts under stimulation from nervous system
(c) Left auricle and left ventricle in higher vertebrates
(d) Entire heart in lower vertebrates
EXPLANATION: (c)
ANSWERS:
(a) The two ventricles together in humans
(b) The heart that contracts under stimulation from nervous system
(c) Left auricle and left ventricle in higher vertebrates
(d) Entire heart in lower vertebrates
EXPLANATION: (c)
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