Step-by-step explanation:
I think they are
1-Bone deep: humans’ bones are in fact getting lighter and more frail. Owing to the sedentary nature of modern life, our bones have decreased in density and strength, most likely due a reduction in physical activity.
2-Gene change :Our genes are in a perpetual state of change, from one generation to the next. One major example of this is the rise in genes allowing for lactose tolerance. This upsurge is most likely due to the fact the majority of humans today drink milk all their lives. Historically, the enzyme that allows us to digest dairy turned off once we hit adulthood — when we were traditionally weaned off our mothers' breast milk.
3-body temperature.