List three dominant groups of animal and plant life (think big group like amphibians instead of frogs, or fish instead salmon) during each the following four geologic eras or eons. precambrian eon paleozoic era mesozoic era cenozoic era

The continental divide a divides the united states into east and west b. divides the united states into north and south c. divides the flow of river systems in the united states into east and west d. is a series of rivers and mountains that separates canada from the united states select the best answer from the choices provided.

Which of the following is not considered one of the four major oceans (1 point)

What first caused people to consider that the continents were once one large landmass?