Help FAQ Getting Started Signup Links. Mobile Apple App Store Google Play Amazon Apps. Term what is a fossil. Radioactive dating biology definition trace of an organism that once lived. Term what did Darwin predict about fossils? Definition He predicted that the fossil record would demonstrate transitional forms between past species raeioactive present ones.
Term What are body fossils? Term What are trace fossils? Definition fossilized biological activity footprints teeth marks burrows coprolites. Term What is sediment? Term How do fossils form? Definition Over time, pressure squeezes water out of sediment and minerals fill in the spaces forming sedimentary rock. Fossils are often uplifted due to the activity of tectonic raduoactive and exposed by erosion. Term How are fossils dated using Stratigraphy?
Definition sediments are added to existing layers over time a fossil from a deeper layer is older than a fossil from a layer close to the surface Relative dating technique: Term How are fossils dated using radiometric dating? Definition radiometric dating measures the exact age of a fossil by measuring the amount of radioactive elements. A radioactive element will decay at a steady rate. The amount of time it radioactive dating biology definition for half of the remaining amount of radioactive atoms to decay is called a half-life.
Fossil ages are determined by half lives. Term what are Homologous structures? Definition structures of different animals that are the same structure but have different functions. Definition members of a population vary in their traits, most of this variation is inherited. Definition certain inherited traits give some organisms a better chance to survive in their environment. Those that survive will produce more offspring.
Definition a genetic change radioactive dating biology definition population over generations.