The first vertebrates to evolve lacked jaws and had skeletons made from a strong flexible tissue called cartilage.As shown in the figure below,________ are a modern example of this ancient group of vertebrates known as jawless fishes. 
Definitions:
Immediate Family
Close relatives, typically including one's parents, siblings, spouse, and children.
Demand for Payment
A formal request for the payment of money owed, often preceding legal action for recovery.
Strong Arm Collection Agency
A debt collection agency known for using aggressive and often intimidating tactics to recover owed money.
Itinerant Sellers
Sellers who do not have a fixed place of business and travel from place to place to sell their goods or services.
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