The correct option is D 1-iii, 2-iv, 3-ii, 4-i
Poikilotherms are cold-blooded animals whose internal body temperature fluctuates with respect to the change in their surrounding temperature. Example: Fish, frog
Homeotherms are warm-blooded animals who can adjust their body temperature and keep it constant even when the outside temperature fluctuates. Example: Mammals
Mimicry (protective coloration) is a phenomenon observed by organisms which involves resemblance with any object or any organism of different species. For example: Organisms adapting the same color as their surrounding in order to protect themselves from predators. Example: Frog
Aestivation is the phenomenon that is followed by certain organisms when they take shelter in deep burrows to protect themselves from extreme heat during the summers. It is also called summer sleep. Example: Frogs