This phylogenetic tree was constructed by comparing sequences for a homologous gene involved in development. select the correct statement. a. frog is the ancestor of both a mouse and a chicken. b. the common ancestor of a human and a frog and the common ancestor of a mouse and a chicken lived at the same time. c. the nucleotide sequence of this gene in a mouse is more similar to the sequence in a chicken, and both are less similar to the nucleotide sequence of this gene in a frog.