There may be more than one answer here, but concerning speciation, sympatric speciation can't occur because of the geographic isolation (must be living in the same environment for this to occur).
The correct answer to this question is letter "C) occupy different niches within the tree." Several species of warblers can live in the same spruce tree ONLY because they <span>occupy different niches within the tree. Hope this answer helps out your question. </span>
Theses two biomes get very little rain and because of this they have a less diversity of fauna and flora.
The differences are that a tundra is very dry and extremely cold and on the other hand a desert is very arid and hot and it can go as high as 54°C (130°F).
