This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. select the correct statement.
a. a phylogenetic tree containing two main branches for evolutionary relationships among the animals.
b. the first branch leads to drosophila. the second branch divides into two branches, 2a and 2b. branch 2a leads to lancelet.
c. branch 2b divides into two branches: 3a and 3b. branch 3a leads to zebrafish. branch 3b divides into two branches: 4a and 4b. branch 4a leads to frog. branch 4b divides into two branches: 5a and 5b.
d. branch 5a leads to chicken. branch 5b divides into two branches leading to human and mouse, respectively.