Organisms that are poikilothermic _______.

Organisms that are poikilothermic _______.
    have temperature fluctuations that coincide with the external temperature and lack internal homeostatic temperature regulatory mechanisms
    maintain their body temperature range even though the external temperature is changing
    maintain their body temperature range even though the external temperature is changing and lack internal homeostatic temperature regulatory mechanisms
    have temperature fluctuations that coincide with the external temperature
    lack internal homeostatic temperature regulatory mechanisms