The three characteristics of a respiratory rate are rate, depth, and rhythm.
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large area
There is no solid that has those characteristics. To have an edge it must have another surface.
Regions refer to areas of the earth's surface that have several common characteristics, such as physical features, climate, culture, or economic activities. These common characteristics help to define and distinguish one region from another, allowing for the study and analysis of different parts of the world.
If the surface area of the organism is small, then there is no problem with getting all the oxygen needed. If the surface area of the organism is large, therefore a special respiratory surface is needed. An example is lungs, gills. The ratio of surface area to volume in a small organism is greater than the ratio in a large organism.
they are 3 dimensional