BIOL 113 Lecture Notes - Lecture 16: Natural Selection, Radiometric Dating, Relative Dating
Document Summary
Animals w hard body parts are more likely to be preserved (shell, bones, exoskeletons) Fossils are formed in different ways: frozen in ice, trapped in amber, buried in thick layer of mud. A collection of fossils arranged in order of age. The fossil record is not complete because not all organisms form fossils. Darwin"s theory of evolution has 2 main test: The most direct evidence for descent with modification is fossils. Fossils reveal intermediate species and changes over time. Tiktaalik transition fossil between 2 major vertebrate groups. In-between fish (fins, scales, and gills) and amphibians (mobile neck, wrists, fingerlike bones, long flat head, sturdy ribs)
