Does the ability to disperse over long distances lower a species' chance of extinction?
a. Yes, as data on Cretaceous gastropods show that species with higher dispersal ability have lower extinction rates.
b. No, there is no relationship between a species' dispersal ability and its range.
c. Not necessarily, this is only the case if species range correlates positively with dispersal abil-ity.
d. No, in Cretaceous gastropods species with long range dispersal have an increased chance of extinction.
C
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