Which fossil occurs on the most landmasses? what does this suggest about when these particular continents broke up?

The Glossopteridales (Glossopteris fossils) occur on the most landmasses. Their distribution across several detached landmasses led scientists to believe that these were once merged into a single supercontinent, Pangea. Their wide distribution suggests that the continents were still together in the times of their existence (298.9 millions of years ago-252.17 millions of years ago). Scientific evidence suggests that Pangea did indeed split after this, 175 million years ago.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.