Why might a trait that is an advantage today become a disadvantage in the future?

A trait that is advantageous today may become a disadvantage in the future due to changes in environmental conditions, social dynamics, or technological advancements. For example, a physical trait that enhances survival in a specific habitat might become detrimental if that habitat changes due to climate shifts. Additionally, traits that confer social status or attractiveness might lose their value as societal norms evolve. This highlights the dynamic nature of evolution and adaptation, where what is beneficial can shift over time.