Which of the following would you use to greet the principal in the morning a. adios b. hasta luego c. buenas tardes d. buenos dias

answer might be "si", would be better if you added answer choices

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.