Give scientific reason: Amphibians show hibernation and aestivation.

(N/A) $\rightarrow$ Amphibians are cold-blooded $(poikilothermic)$ animals.
$\rightarrow$ During extreme winter and summer seasons,they bury themselves deep in the mud of dried lakes or ponds to remain inactive,which helps them survive extreme fluctuations in temperature.
$\rightarrow$ Hibernation refers to the period of inactivity during winter to escape cold,while aestivation refers to the period of inactivity during summer to escape heat and desiccation.
$\rightarrow$ Thus,amphibians exhibit both hibernation and aestivation.