Correct answers only ! elige la palabra mejor para completar la oración. --para no quemar (to burn), uso cuando estoy afuera.

Spanish answer - Bloqueador

English Translation -  To not burn, I use a sunscreen when I'm outside.

when the outside temperature is too cold, an endothermic animal can generate heat by shivering. endothermic animals must eat much more often than ectothermic animals since it takes energy to maintain a constant body temperature.