Cold-blooded animal cannot regulate their body temperature according to temperature changes, so they slow down as a response to the cooling temperature.
Those animals who cannot regulate their body temperature according to the outside change in temperature. They cannot survive the extreme hold temperature. Example: reptiles and fishes
When the room temperature falls, a cold-blooded animal slow down as a response to the cooling temperature.
Therefore, option a aptly describes the cold-blooded animal.
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