The pangaea theory supports the theory of plate tectonics because

a. it is based on the idea that there were several land masses when earth was first created

b. it is based on the idea that all the present continents were one supercontinent

c. it does not require scientists to support the notion that earth's plates can move

d. one day, earth will have one large land mass again

B. it is based on the idea that all the present continents were one supercontinent

Explanation:

This is the answer because Pangaea is the name of the supercontinent whose existence is theorized. This theory supports plate tectonics because if it wasn't for plate tectonics, all the continents would still be a single large landmass.

doctrine that the us had the right to expand throughout north america.