Composition of species can change over time. Species can go extinct. C. Evidence for evolution 1. A fossil is any evidence of life preserved in the geologic record. Fossil evidence indicates that life has changed over time.
Transitional fossils possess a mix of traits from two currently separate groups.
Evolution is descent with modification through time. A. Evolution - some common misconceptions 1. B. is - constantly happening and still going on 1. Evolution is not an existential concept, but can be observed. Evolution is a theory, repeatedly tested and supported by the evidence.