What causes plates to move on the mantles surface?

a. electrical forces
b. convection currents
c. magnetic field
d. all of the above

Which is an example of a population?

It is believed that europa, one of jupiter’s moons has an ocean beneath its surface. based on how earth’s oceans and atmosphere are believed to have formed, what can be said about europa’s supposed ocean? the arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced , similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s .

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?