Temperature matters a lot to ____ living things! Some organisms have some ____ over their internal body temperature. For example, ____ and birds are able to keep their temperature steady even if the conditions outside are hotter or colder than their body temperature. We call these organisms “____-blooded” (or homoiothermic). But most other living things are “____-blooded” (poikilothermic). Their ____ cell temperatures go up or down along with the temperature ____. Temperatures in cells need to be at a level which will allow the organism’s ____ to work properly – too hot and they ____, too cold and they are too slow. And temperature will ____ a lot from day to night, and with the seasons, so most organisms have ____ that will help them survive these changes.

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