The area between the lungs, in the chest cavity, that contains the heart, aorta, trachea, esophagus, and bronchi is known as the

The mediastinum

Explanation:

The mediastinum is a division of the thoracic cavity; it contains the heart, thymus gland, portions of the esophagus and trachea, and other structures.

that is wrong, its not thymus.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above