Final answer:
A plane passing through a point and containing the line of intersection of two planes, such as a sagittal and a transverse plane, results in an oblique plane, which is neither horizontal, vertical, nor parallel.
Step-by-step explanation:
When considering the characteristics of anatomical planes relative to the body of an organism, particularly for medical or biological purposes, understanding the various types of planes is essential. A plane that passes through a point and contains the line of intersection of two other planes takes its orientation from those two intersecting planes. If the two intersecting planes are a sagittal plane, which divides the body into left and right portions, and a transverse (or horizontal) plane, which divides the body into upper and lower portions, the resultant plane could not be accurately described as horizontal, vertical, or parallel. Rather, it would be an oblique plane, which is inclined and does not conform strictly to any orthogonal orientation.