1. Evolution Now

: Random chance events (like a natural disaster) can abruptly change which traits are passed down by removing certain individuals from the population.

Evolution is driven by four primary mechanisms that alter the genetic makeup of populations: 1. Evolution

: Organisms with traits better suited to their environment are more likely to survive and reproduce, passing those advantageous genes to their offspring. : Random chance events (like a natural disaster)

Scientists distinguish between two scales of evolutionary change: Evolutionary mechanisms part 1: What is evolution? Evolution is the gradual process of biological change

Evolution is the gradual process of biological change in a population's inherited traits across successive generations. It is often described as "descent with modification," where all life on Earth is linked by a shared ancestry that has diversified over billions of years. Core Mechanisms of Evolution

: Random changes in genetic material create new variations. While many mutations are neutral or harmful, some provide benefits that natural selection can then act upon.

: The movement of genes between different populations through migration and interbreeding. Scale and Patterns