#Question id: 4977
#XL - S Microbiology
There are at least a dozen known species in the extinct genus Lystrosaurus. If each species was suited to a quite different environment, then this relatively large number of species is likely due to
#Question id: 4978
#XL - S Microbiology
The dicynodonts survived the mass extinction that was most closely correlated in time, if not in cause, with
#Question id: 4979
#XL - S Microbiology
The dicynodonts that survived the Permian extinction would initially have had to endure (or escape from) the physical effects of __________, and subsequently, the biological effects of __________.
#Question id: 4980
#XL - S Microbiology
If an increase in dicynodont species diversity (i.e., number of species) occurred soon after the Permian extinction, and if it occurred for the same general reason usually given for the increase in mammalian diversity following the Cretaceous extinction, then it should be attributed to
#Question id: 4981
#XL - S Microbiology
An organism has a relatively large number of Hox genes in its genome. Which of the following is not true of this organism?
#Question id: 4984
#XL - S Microbiology
A hypothetical mutation in a squirrel population produces organisms with eight legs rather than four. Further, these mutant squirrels survive, successfully invade new habitats, and eventually give rise to a new species. The initial event, giving rise to extra legs, would be a good example of