Cumulative selection is the accumulation of many small evolutionary changes over long periods of time and also through many generations. This relatively new type of selection is a significant and important adaptation compared to ancestral species. Kin Selection is the natural selection of an organism based on a particular behaviour or trait that enhances the overall quality of life for any closely related individuals. This increases the fitness of the particular individual indirectly.
Over a period of time, an organism slowly develops adaptations/features through silent mutations or many small evolutionary changes. These changes may assist them in their current environment. From figure a to figure d, an area of light sensitive cells are formed into a lens. This is a result of prolonged exposure to light.
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