Expresa esto en español usando la construcción que aprendiste en esta sección:
No podemos encontrar nuestras llaves

beatriz just sent me an electronic message with a picture of my granddaughter.

what do i do to see the photo?

do i click here to open it?

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.