Question

Ribs were first developed in which phylum

Pls respond​

Answer 1

Answer:

The first rib is attached to thoracic vertebra 1 (T1). At the front of the body, most of the ribs are joined by costal cartilage to the sternum. Ribs connect to vertebrae at the costovertebral joints. The parts of a rib include the head, neck, body (or shaft), tubercle, and angle.

Answer 2

ribs where first developed in phylum chordata