Answer :
The group of animals that have double circulation is the Vertebrates.
Relation of double circulation with body temperature:
• In double circulation, the blood passes through the heart twice and hence is purely purified that is deoxygenated blood is separated from oxygenated blood.
• Thus, in this way a greater oxygen is available.
• Animals such as birds and humans require a high and constant supply of energy to maintain their body temperature.
• Greater oxygen availability insures the high supply of energy to the animals.
• The animals get high energy supply for maintaining the body temperature.
• Hence double circulation provides high oxygen supply to maintain body temperature.
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