Descent refers to the process of moving downward from a higher position to a lower one. This can occur in various contexts, such as when a person climbs down a mountain or when an aircraft airplane descends to land. Descent can also describe the decline in altitude or elevation in geography. In a biological context, descent can refer to the transmission of traits or characteristics from ancestors to descendants. This concept is often discussed in relation to evolution, where species evolve over time through processes like natural selection, leading to changes in their descendants.