Final answer:
The cultural constructs of human variation are best explained by the combination of environmental and genetic factors. The concept of race as a biological construct is not supported by scientific evidence.
Step-by-step explanation:
The cultural constructs of human variation are best explained by the combination of environmental and genetic factors. Factors such as social status, ethnicity, age, nutrition, quality of life, access to healthcare, work, and occupation contribute to human variability. Additionally, genetic factors play a role in determining traits such as skin tone, eye color, and hair texture. However, it is important to note that the concept of race as a biological construct is not supported by scientific evidence. There is more genetic variation within a racial category than between racial categories.