Which kind of biological evidence is most often used to account for change in human species?​

A) ​size and shape of pelvis
B) ​length of spinal column
C) ​size and shape of the skull
D) ​existence of a brain

The size and shape of the skull is the most common biological evidence used to account for change in the human species, as it provides information about brain size and evolution. Other factors such as the size and shape of the pelvis and spinal column can also provide important information about the evolution of bipedalism and upright posture. However, these factors are not as commonly used as the skull. The existence of a brain is also important, but it is not necessarily used as evidence for change in the human species, as all humans have a brain.