Because some of the systems were based on what land would produce, rather than the physical area, they are listed in their own section.

The physical area where a species lives, is its "habitat."

Ballyhea covers a large physical area with its population spread throughout.

She lived in a world far above me even when we shared the same physical area and conditions, but there was nothing unfriendly about her.

Similar limitations apply to all living things, and are known as the carrying capacity of a physical area.

The four academies are located in physical areas of the school.

Because of its limited physical area, there is very little fluctuation in population.

Despite its relatively large physical area, it has a comparatively small population (of less than 1 million people).

The miners were in small physical areas, and the work was manual.

The school had new labs, band, chorus, and physical educational areas.