Imagine that you are a paleontologist. In a recent dig, you unearthed the following bones: jaw bone, vertebral column, and femur (thigh bone). Which phylum does the organism you unearthed belong to?

Chordata

Explanation:

Chordata is an animal phylum which is categorized of having a cord or a back bone. These animals having a backbone and a notochord are called chordates. While non-chordates are those animal who does not have a notochord in their body structure.

Thus in the context, the unearthed bones belongs to the chordata phylum as they are the vertebrates, thigh bones and jaw bones. All of this are the feature of a chordate.

Hence the answer is - - - chordata