Final answer:
We possess genetic codes for traits that ensured the survival and reproduction of our ancestors, encompassing adaptations such as physical strength, disease resistance, and cognitive abilities.
Step-by-step explanation:
Our genetic makeup is a result of natural selection acting on our ancestors' traits, favoring those that conferred a survival advantage. Traits like physical strength enhanced the ability to hunt or defend against predators, contributing to survival. Disease resistance ensured that individuals were more likely to reach reproductive age. Cognitive abilities, including problem-solving and social skills, facilitated cooperation and community building, further supporting the success of our ancestors.
These genetic codes are a product of the selective pressures faced by our ancestors in their environments. The advantageous traits that helped them survive and reproduce were passed down through generations, forming the basis of our genetic inheritance today.