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The resonances imply that planet - - disk interactions and subsequent resonance capture between multiple planets are key processes that shape the structure of planetary systems . Yet interpreting species diversity from fossil data sets is essential to understanding what is " natural " for biodiversity patterns today . These differences in generic richness are reversed when comparable numbers of specimens are compared through rarefaction analysis , probably because the original researchers were interested only in the best-preserved specimens for taxonomic purposes , leading to a much steeper rarefaction curve . A petition to Pakistani authorities is available here . It is in the areas of mine clearance , mine awareness and victim assistance that NGOs are likely to find their greatest role in this Convention implementation phase .