What do the forks in the branches of a phylogenetic tree represent O a Points in the past where a gene pool was permanently

Question

What do the forks in the branches of a phylogenetic tree represent O a Points in the past where a gene pool was permanently split in two O b Points in the past where families became genera O c Points in the past where two gene pools merged to form a new species O d Points in the past where improvements were made in species

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