Question

Consider four species of conifers. species a and b are sister species. species c and d are also sister species. the clade containing species a and b is a sister to the clade containing species c and

d. not counting the root as a node, how many nodes would be found in a phylogenetic tree of species a, b, c, and d?

Answer 1

Two nodes would be found in a phylogenetic tree of species a, b, c, and d.