What is the major difference between prokaryotes and eukaryotes?

Prokaryotic cells have no nucleus or membrane-bound organelles (like the mitochondria). An example of these are bacteria. Because they don't have a nucleus, their DNA floats around in the cytoplasm. Eukaryotic cells have a nucleus and organelles Their DNA is contained within the nucleus.

Those are some (not all) of the differences between the two cells. Hope this helps!

c. heat from the poles back down towards the equator.