The fact that most of us have five lumbar vertebrae, but some people have six and some have four, is an example of ________ variation among organisms.

A) cellular
B) holistic
C) physiological
D) anatomical
E) reductionist

Lumbar Vertebrae

The five vertebrae situated between the thoracic vertebrae and sacral spine, forming part of the lower back and supporting much of the body's weight.

Anatomical Variation

Anatomical variation refers to the natural differences in the shape, size, and structure of a body part among different individuals.