The staircase line indicates the position of the metalloids in the Periodic Table.
We cannot visualize the organs or tissues inside of our body, but a biopsy helps in making a diagnosis by providing a piece of tissue for examination. Biopsies are often associated with cancer, but they can be used to diagnose other conditions and to see how far a disease has progressed.
There will be a horizontal line between them and one of the individuals will not be connected to the original individuals.
Hope that helps :)