Select all the people whom you would address using usted. 1. your brother
2. your teacher
3. a five-year-old boy
4. a police officer

1. your brother  = su hermano

2. your teacher = su maestra (maestro)

which dialogs ? ?

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.