Chapter 20 - Processes of Evolution - 20.5 - Multiple Factors Account for the Maintenance of Variation in Populations - 20.5 Recap - Learning Outcomes - Page 442: 1

Organism tend to evolve structures that assist them in surviving and reproducing in their various environments. This evolution takes the form of altering what is there already. For example, wings in insects and vertebrates arose as convergent modifications of existing structures. During development, the bones that comprise wings grow to different shapes and lengths in various organisms. Evolution simply proceeded differently in producing bird, bat, and insect wings.

Organism tend to evolve structures that assist them in surviving and reproducing in their various environments. This evolution takes the form of altering what is there already. For example, wings in insects and vertebrates arose as convergent modifications of existing structures. During development, the bones that comprise wings grow to different shapes and lengths in various organisms. Evolution simply proceeded differently in producing bird, bat, and insect wings.