Biology, asked by lsohanlal537, 8 months ago

what is the meaning of the term double circulatery system? why is it necessary in birds and mammals?​

Answers

Answered by kajaldogra570
1

Answer:During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.

Explanation:

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