distribution
the way something is spread out or arranged over a geographic area
A transglottic mass is a mass has spread. In this case the mass would have spread across the area of the glottis from the supraglottic to the infraglottic area.
An endemic species is one that is commonly found in a given habitat, such as whitetail deer in the woods and pastures of the Eastern US.
topography
organismal
In Geography, the spread of something over a given study area is concentration.
1. The area covered by something 2. The degree to which something has spread
Your answer is in your categories. Its paleontology, or biogeography.
Density
the way something is spread out or arranged over a geographic area
Area of Study/Trade
Economics is not a specialized skill, rather, an area of study. One cannot economic something.
This can be anything from a Computer Programmer to a Computer Engineer depending on the speciality and area of study you are wanting to go into
Area of Study/Trade
It seems like there might be a typo in your question. Did you mean "spread"? If so, spread can mean to extend over a larger or broader area, or to distribute or cover something over a surface.
The scope is the extent of the area or subject matter that something deals with or to which it is relevant. A delimitation is the boundaries the researcher has set for the study, the place where the researcher lists the things they are not doing and why they are not doing them.
francis bacons area of study