Question

which phylum have cold blood​

Answer 1

Animals that cannot naturally regulate their body temperatures are considered to be ectothermic or cold-blooded. Insects, arachnids, fish, reptiles, and amphibians are generally cold-blooded.....

Answer 2

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Reptiles, amphibians and fish are usually described as being 'cold blooded', because they do not maintain a constant body temperature, as mammals and birds do.