Modern populations can show a variety of different size distributions. Fossil assemblages can also show size-frequency patterns. What sorts of processes can modify the original population polygons of a once-living species?

Paleocommunities through time increased their diversity by the expansion of eco-space. Why then did diversity reach a plateau during the Paleozoic but appears to still be increasing in the Modern fauna? Large-scale ecological changes seem to be decoupled from major changes in taxo-nomic diversity. Is this a valid observation or are our data too crude to actually test this?

The Earth has suffered huge extremes in climate through time. Can the Gaia hypothesis help explain these climate swings? Will the planet ever experience a real snowball Earth?

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