Which of the following group of animals maintain high and constant body temperature such as mammals

Which of the following group of animals maintains high and constant body temperature such as mammals?

Which of the following groups of animals maintain a higher constant body temperature as in mammals ?

Which of the following groups of animals maintain a higher constant body temperature as in mammals ?

Which of the following group of animals have a constant body temperature?

Which one among the following groups of animals maintains constant body temperature in changing environmental conditions ?

Which of the following groups of animals is having tube in tube body plan?