Life Science

• Evolution

  Scientific theory since verified and tested over time
• BioEvolution

  1. Gradual changes in living organisms over long periods

  2. Life- forms changed to become present life form
• Fossils

  Remains of ancient life forms preserved in sedimentary
• Paleontology

  Study of fossils
• Different types of fossils

  • Minerals or petrified fossils
  • Soft parts decay and are replaced by minerals or silica
  • Mold fossils - a hole in the shape of the organism
  • Cast fossils - a mold filled with minerals
  • Amber - insect trapped in transparent yellow tree resin
• Fossilisation

  1. Death

  2. Decay of soft parts

  3. Rapid burial under sediment

  4. Mineralisation and petrification
• Relative dating

  Comparing the age of one fossil to another, using index fossils to determine the geological time period
• Radiometric dating

  Using the predictable decay of radioactive isotopes to estimate the age of materials
• Relative dating

  Compares age to another, not exact age
• Radiometric dating

  Provides the exact age of materials