Ayer paula me (decir) que el ano pasado ella (estar) estudiando en mexico. ella tambien me (decir) que (ser) una experiencia maravillosa.

me (decir) ; = said

ella (estar); =was

me (decir); = said

Explanation:

decir means say, so the past tense of that is said.

(same for the last blank space)

(estar) means to be which can be used as was

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.