Q13. It tells us the only possibility is that these regions were once connected.
Q14. It proves that Antarctica had a tropical climate before.
Q15. It tells us that the Antarctica was nearer to the equator before as compared to where it is today.
Q16. It tells us that these continents were once connected before, since this kind of animal cannot swim across the vast ocean.
Q17. The edges of the continents are useful in reconstructing Pangaea. Aside from the fitting of edges of the continents, the presence of evidences found in the same continents made the reconstruction easier.
Q18. Europe and Asia were neighbors in the north.
Q19. Yes, if the continents continue to move.