Evolution.

Evolution is the gradual change in organisms over millions of years. Scientists know this happened because of strong evidence like fossils showing how creatures slowly changed, similarities in body structures across different species, and how organisms adapt perfectly to their environments.

When animals moved from water to land, they developed amazing adaptations. Fish developed lungs instead of only gills, grew limbs from their fins, and changed their skin to prevent water loss. Look at the lungfish in Nigerian rivers—it can breathe air and survive in mud during dry seasons, showing it's adapted for both water and land life.

These adaptations didn't happen overnight. Over thousands of generations, small changes accumulated, creating new features that helped organisms survive in new environments. This is how evolution works—nature rewards survival.

Evolution is the gradual change in organisms over long periods of time. Scientists have developed different theories to explain how this happens. The most famous theory is Charles Darwin's Theory of Natural Selection, which says that organisms with traits best suited to their environment survive and reproduce more successfully than others. These beneficial traits then pass to their offspring, causing the species to change slowly over many generations.

Think of it like this: imagine a population of peppered moths in England. During the Industrial Revolution, pollution darkened tree bark, so darker moths survived better because predators couldn't see them easily. Over time, more dark moths appeared in the population because light moths got eaten more often.

In Nigeria, you can see evolution in action with our mosquitoes developing resistance to insecticides. Each year, some mosquitoes survive the spray because they have genes that protect them. These survivors reproduce, and soon most mosquitoes become resistant to that insecticide.