1 / 7

Fossil Evidence: Insights into Evolution and the Geological History of Texas

This article explores the significant fossil evidence supporting evolutionary theory, particularly focusing on Texas, which was once submerged by ancient seas. It delves into various fossil types, including imprints, casts, and preserved organisms in amber or ice. The fossil record reflects the geological time scale, with methods like relative and radiometric dating used to estimate ages. Further, the piece addresses homologous structures, vestigial traits, and embryological development, all of which highlight common ancestry among species and the intricate web of life’s evolution.

sancha
Télécharger la présentation

Fossil Evidence: Insights into Evolution and the Geological History of Texas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 7.2 Evidence for Evolution

  2. Fossil Evidence • Texas fossils proved it was once covered by sea • Kinds of Fossils • Fossil – any evidence of life from an earlier geological time

  3. Imprint of a leaf, feather, or organism in rock • Cast made of minerals that fills in the follows of an animal track, mollusk shell, or other parts of an organism • A piece of wood or bond replaced by minerals • An organism frozen in ice • An insect or other organism trapped in amber • Sedimentary Rock – a rock type formed from particles of preexisting rocks

  4. The Fossil Record • Scientists developed a geologic Time Scale • Relative Dating • Estimate of how old a fossil is • Based on the idea that the lower it is, the older it will be. • Radiometric Dating • Radioactive elements – give off radiation due to an unstable nucleus • Compares radioactive to non radioactive material to determine dating • Several samples to obtain consistent results • Uranium

  5. Fossils Show Evolution Occurred • Simple life forms from past times • Other Evidence for Evolution • Homologous – body parts that are similar in origin and structure • Homologous structures indicate that two or more species might share a common ancestor • Dolphin flipper and bird wing

  6. Vestigial Structures • Vestigial structure – a body part that doesn’t seem to have a function • Whales and snakes with hip bones • Embryology • Embryology – study of the development in organisms • Gills in all mammals

  7. DNA • Closely related organisms have similar DNA • Bears and Dogs • All primates have a common ancestor • Share hemoglobin, a protein in red blood cells that carries oxygen

More Related