Evidence for change across time Fossil record shows gradual change over time of a large number of species Higher Rock levels Younger Fossils found here. Fossils are similar to modern species Lower Rock levels Older fossils found Fossils are much different from modern species
Scientists who study the stages of growth and development that living organisms pass through as they grow from fertilized egg to mature adult.
Embryology- Branch of developmental biology that focuses on the early development of organisms before they are born or hatched. Embryo- Developing organisms during the prebirth/prehatch stage.
Evolutionary Biologists are scientists who study how living organisms change physically over time. Charles Darwin wrote “The Origin of Species” Evolution through Natural Selection
Homologous Structures- Characteristics that are similar among different organisms because they evolved from a common ancestor. Vestigial Structures- Structures that seemingly serve no purpose in some animals that are functional in other animals.
Evidence for common ancestor Structures evolved and changed across time
Shows Evidence of change over time as structures that no longer serve a purpose are still present.
The Pelvic Girdle was functional in the ancestors of the modern Whale. The structure no longer serves a purpose but is still present