Definition: A 1D measurement of a single cell. Typically, this is the distance along a straight line connecting the left-most part of the cell to the right-most part of the cell. It is perpendicular to the length axis and the depth axis.
Definition: position of an organism in a food web. May be described verbally with descriptors including primary producer, herbivore or carnivore. If described numerically, 1 indicates a primary producer, 2 a herbivore, and so on up the food web.