Variations in evolution usually refers to variation of genes at a particular loci. This differs from diversity which is the total of genetic differences within a population. Speciation is the reproductive isolation of a subset of a population.
THe answer to this question would be: ribosome.
Ribosome function is in protein synthesis. To do synthesis a protein, it will need an RNA with a specific structure. The RNA is made from the nucleus, so if nucleus can copy their DNA into RNA, the protein synthesis will not be able to be executed.
It is Uranus.
Its spin axis is tilted at 98 degrees.
Basically, it spins on its side.
Hope this helps!
:)
