Question

which 'factor' decides whether the Animal is cold blooded or warm blooded?

Answer 1

The most important adaptation is how animals regulate their body temperature. 
Cold-blooded animals do not maintain a constant body temperature
warm blooded animals maintain a relatively constant body temperature or they would suffer dire consequences

Answer 2

The number of chambers present in the heart.
Because cold blooded organisms don't need maintain their body temperature conten.But in the case of warm blooded organisms they need a contest body temperature for their survival and they need more energy for maintaining their temperature


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