Chapter 15 - Tracing evolutionary history. This chapter presents the following content: Conditions on early earth made the origin of life possible; talking about science: Stanley Miller’s experiments showed that the abiotic synthesis of organic molecules is possible; the formation of polymers, membranes, and self-replicating molecules represent stages in the origin of the first cells; | Chapter 15 Tracing Evolutionary History PowerPoint Lectures for Biology: Concepts & Connections, Sixth Edition Campbell, Reece, Taylor, Simon, and Dickey Lecture by Joan Sharp Copyright © 2009 Pearson Education, Inc. Introduction: On the Wings of Eagles, Bats, and Pterosaurs Wings have evolved from vertebrate forelimbs in three groups of land vertebrates: pterosaurs, bats, and birds The separate origins of these three wings can be seen in their differences – Different bones support each wing – The flight surfaces of each wing differ Copyright © 2009 Pearson Education, .
