CA Science Standard- Evolution 7.3 Biological evolution accounts for the diversity of species developed through gradual processes over many generations. As a basis for understanding this concept: c. Students know how independent lines of evidence from geology, fossils, and comparative anatomy provide the bases for the theory of evolution. National Entrepreneurial StandardsInformation Management K - Understands the concepts, systems, and tools needed to access, process, maintain, evaluate, and disseminate information for business decision-making Depth and Complexity- Relate Over TimeWhat are the effects of time on living organisms? have characteristics that are shared by related species because they were inherited from a common ancestor. For example, bones in a human arm are homologous to the bones in a cat arm, bat wing, and whale flipper. A good way to remember this is that "homo" means the same. Analogous structures serve the same function in different species but they evolved independently rather than from the same embryological material or from the same structures in a common ancestor. Examples are the wings on birds, bats, and insect. Vestigial structures have marginal or no use to an organism but once had some function in its ancestor. Examples: Whale pelvic bone, eyes for bats and moles, snake leg bones, and human tailbone and appendix.