Final answer:
The radiopaque area located between the apices of teeth #8 and #9 is called the pulp chamber. It contains the pulp, which consists of blood vessels, connective tissue, lymphatic vessels, and nerves.
Step-by-step explanation:
The radiopaque area located between the apices of teeth #8 and #9 is called the pulp chamber. The pulp chamber is the innermost part of the tooth that contains the pulp, which consists of blood vessels, connective tissue, lymphatic vessels, and nerves. It plays a vital role in nourishing and providing sensation to the tooth.