Which of the following is an oviparous homeothermic vertebrate?
Platypus is an oviparous mammal. Birds and mammals are homeothermic (warm-blooded).
Horse (Mammalia) is a viviparous homeothermic animal.
Crocodile (Reptilia) is an oviparous poikilothermic animal.
Viper (Reptilia) is a viviparous poikilothermic animal.