PPT-FOSSILS- Evidence from Once-living Organisms

Fossils found in SEDIMENTARY ROCKS The lower the sediment layer is the older the fossils of the layer will be Law of Superposition As time elapses more and more sediment layers form to create the layers of sedimentary rocks. Remains . of once living organisms.. Form from decay and are buried by sediment.. Sediment hardens into rock and preserves the shape of the organisms.. Fossils. Fossils . Remains. Molds. . Casts. . “Evidence for Evolution”. We will look at major evidence supporting theories of evolution:. Fossil Record . Comparative Anatomy . Biogeography . Biochemistry. Evidence Supporting Theories of Evolution . Charles Darwin. Father of Evolution. Proposed a way . how. evolution works. How. did creatures change over time?. by . natural selection. Collected a lot of . evidence to support. his ideas . 1809-1882. Organism DNA. 1a. Some of the strongest evidence for evolutionary relationships comes from studying the DNA of different organisms.. 1b. The fact that all organisms use the same DNA molecule to code for genetic information suggests that these organisms share a distant ancestor.. . Fossils are the . preserved remains . or traces of . living. things. Most fossils form when . living. things die and are buried by . sediments. . The . sediments. slowly harden into . rock. Evidence. Evidence. . of . common ancestry . among species comes from many sources.. . 2. #1 Fossil Evidence. . Fossils. Earth is . Millions. of years old!. Fossils in . older layers . are . more primitive . 2. Fossils provide evidence of organisms that lived in the past. 3. The wing of a bat has bones that are similar to those in the human arm. 4. DNA can tell us how closely related 2 organisms are.. 5. Whales are descended from land dwelling mammals. SBI3U1. Evidence. for . Evolution. The theory of evolution by natural selection was proven by the following methods: . Fossil . Record. Biogeography. Anatomy. Embryology. DNA. Fossils are found within the layers of sedimentary rock. . you describe how this form of communication has changed over time?. Essential Question:. How do scientists define and support the theory of evolution?. Standards:. S7L5a. Explain that physical characteristics of organisms have changed over successive generations (e.g. Darwin’s finches and peppered moths of Manchester). Fossils have helped determine approximately when life first appeared, when plants and animals arrived on land, and when organisms became extinct.. CONDITIONS NEEDED FOR FOSSIL FORMATION. Whether or not a dead organism becomes a fossil depends upon how well it is protected from scavengers and agents of physical destruction, such as waves and currents.. Evidence. Evidence. . of . common ancestry . among species comes from many sources.. . 2. FIVE PIECES OF EVIDENCE FOR EVOLUTION. G – Geographical . distribution . F – Fossil . evidence (remains of ancient organisms). 8. th. grade. Compare . fossils found in sedimentary rock to determine their relative age. . . http://www.brainpop.com/science/diversityoflife/fossils. /. . Standard for this lesson: . How can we tell what lived when?. ASSISTANT PROFESSOR. Department of Zoology. Nilkantharo. . Shinde. Science and Arts College, . Bhadrawati. Fossils. – . Sir Charles Lyell. Fossil can be defined as . “Any body or traces of body, animal or plant buried and preserved by natural cause”.. The First Organic . Molecules. All living things consist of organic molecules. .. How did these building blocks of life first form? Scientists think that lightning sparked chemical reactions in Earth’s early atmosphere. They hypothesize that this created a ‘‘soup” of organic molecules from inorganic chemicals. In 1953, scientists Stanley Miller and Harold Urey used their imaginations to test this hypothesis. They created a simulation experiment to see if organic molecules could arise in this way .