Chromosome 2 in Homo sapiens formed when two smaller chromosomes fused,after the chimpanzee and human lineages split.As a result,humans have 23 pairs of chromosomes and chimpanzees have 24 and can no longer form fertile offspring (Fig.14.31) .This would allow humans and chimps to evolve independently while living in the same location also known as: 
A) Gradualism
B) Allopatric speciation
C) Parapatric speciation
D) Natural selection
E) Sympatric speciation
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