Humans are categorized as Homo sapiens. Despite the fact we are all the same species, race structure is evident around the world. Suppose we looked into the distant future and saw that speciation had occurred in humans along racial lines (Asian, Hispanic, Caucasian, etc.) Provide a scenario that could have led to this situation.
Can you think of a reason why this is NOT very likely to occur?

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

a bird that nests only in a particular tree species.