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Q.

Which of the following has a double circulatory heart?
 

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a

 Only birds

b

Only mammals

c

Only reptiles

d

 Both 1 and 2

answer is D.

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Detailed Solution

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Birds and animals both have double circulation. Their hearts are four-chambered, with two atria and two ventricles. The oxygenated blood from the lungs enters the left atrium and is delivered to the aorta via the left ventricle.
 

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