The lungs are
connected by the mediastinum

divided into seven lobes

separated by the mediastinum

divided into nine lobes

The lungs are separated by the mediastinum. This anatomical region is the central compartment o f the thoracic cavity. It is located between the lungs and contains all the principal tissues and organs of the chest such as the heart, trachea, esophagus, thymus etc. The lungs are the only chest organs not contained in this region.

It is surrounded by the breastbone, vertebral column and is bounded laterally by the pericardium as well as being continuous with the loose connectinve tissue of the neck.

a. Divided into seven lobes

Explanation:

Your lungs are divided into seven different lobes. Each of these lobes have sacs and they are assigned a different role each for the lungs. These seven lobes help you breath, and when you breath, it helps you stay alive. The answer to the question is a. Divided into seven lobes.

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.

the answer is trees if i'm not mistaken