Which animal can move very slowly or cannot move when temperature is lower than room temperature?

Well, room temperature can vary from 40 degrees Celsius to -40 depending on where you are, but generally ectoterms such as reptiles, amphibians and fish which rely on heat from the enviroment to power their metabolism become less metabolically active when placed in areas colder than they're adapted to. It's why there aren't that many reptiles and amphibians in polar climates, though fish are evoltuonary much more diverse and have those that are capable of living in cold waters (which still aren't frozen ice) have evolved ways to deal with it.