Which of the following best represents the impact of evolution on human development?
a. Biologically, humans have changed drastically since the origin of Homo sapiens.
b. Our development of bipedal locomotion is the most distinctive characteristic of our species.
c. Cultures shape the raw material of biology into widely different paths throughout the life span.
d. Instincts reduce humans' capacity for cultural learning more than they reduce animals' capacity for cultural learning.