Which of the following would be useful in creating a phylogenetic tree of a vertebrate taxon?

Below are useful in creating a phylogenetic tree of a vertebrate taxon:

1.      DNA sequence from living organism or also known as genetic sequence, it is used to determine strand of DNA

2.      Behavioral data from living species, a method to identify the origin of individual in behavioral aspect

3.      Morphological data from fossils, study the arrangement and physical aspect of organism 

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.