Choose "extinct" if the species is extinct and "endangered" if the species is endangered. two hundred years ago, billions of passenger pigeons lived in north america. the last known passenger pigeon died in the cincinnati zoo in 1914.

Because the last known passenger pigeon died, that would make the species extinct

Answer:

5.6⋅10−^19  j

do you need the explaination?

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).