Compare radiometric dating and relative dating techniques. Warm up: Compare radiometric dating and relative dating techniques.

Absolute Dating Relative Dating Exact # Relative Age Radiometric dating Isotopes decay Half life Relative Age Relates to age of surrounding layers of rock Different forms of an element.

Get a piece of paper and draw 3 columns. What I Know… About the origin of life. What I want to know… What I Learned… (Wait for this part) http://www.youtube.com/watch?v=XvMgoelauLQ

The Origin of Life Early Ideas The History of Life The Origin of Life Early Ideas Spontaneous generation idea that life arises from nonlife. Francesco Redi tested the idea that flies arose spontaneously from rotting meat.

The Origin of Life Early Ideas The History of Life The Origin of Life Early Ideas The theory of biogenesis states that only living organisms can produce other living organisms. Louis Pasteur designed an experiment to show that biogenesis was true even for microorganisms.

The primordial soup hypothesis. The History of Life The Origin of Life Modern Ideas The primordial soup hypothesis. Organic molecules could have been synthesized from simple reactions. UV light from the Sun and electric discharge in lightning might have been the primary energy sources.

The History of Life The Origin of Life Stanley Miller and Harold Urey showed that simple organic molecules could be made from inorganic compounds. http://glencoe.mcgraw-hill.com/sites/0078802849/student_view0/unit4/chapter14/concepts_in_motion.html#

Why are amino acids important?

Life requires proteins. The History of Life Making Proteins Life requires proteins. One possible mechanism for the formation of proteins would be if amino acids were bound to a clay particle.

Some RNA sequences appear to have changed very little through time. The History of Life Genetic Code Some RNA sequences appear to have changed very little through time. Many biologists consider RNA to have been life’s first coding system.

Scientists hypothesize that the first cells were prokaryotes. The History of Life Cellular Evolution Scientists hypothesize that the first cells were prokaryotes. Many scientists think that modern prokaryotes called archaea are the closest relatives of Earth’s first cells. Archaea also do not need or produce oxygen.

The Endosymbiont Theory The History of Life The Endosymbiont Theory The ancestors of eukaryotic cells lived in association with prokaryotic cells. The relationship between the cells became mutually beneficial, and the prokaryotic symbionts became organelles in eukaryotic cells This theory explains the origin of chloroplasts and mitochondria.

Chapter 14 The History of Life 14.2 The Origin of Life

Evolution of Basketball

In which type of rock do paleontologists search for fossils? The History of Life In which type of rock do paleontologists search for fossils? igneous metamorphic sedimentary volcanic

At one time people believed that mold growing The History of Life At one time people believed that mold growing on a piece of cheese was created by the cheese. This is the idea of __________. biogenesis transgenesis primordial generation spontaneous generation

White People are Mutants.

National Geographic How life Began