Which expression would most spanish speakers use to greet a teacher at 2 p. m.

It would be; Buenas tardes, Maestra!

Which in English it means; Good afternoon, Teacher!

Hope that helps too :D

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.