2. What is evolution?
It means that all living things on earth are
descendent from a common ancestor
The great diversity of organisms is the result of
more than 3.5 billion years of evolution
Million of different species of plants, animals
and microorganisms that live on earth today are
related by descendant from common ancestors
3. • Concept of common descendant and natural
selection were first proposed by Charles
darwin in his famous book “origin of species”
4. What is evolution?
“Any change in the heritable trait within a
population across generation”
“Gradual change in the living organisms”
Father of evolution: Charles Darwin
5. Evolution
• Simple Unorganized state of elementary
substance changed by gradual development
into complex structure of physical world
• Origin of species: book by Darwin
• Theories
• Theory of eternity
• Theory of special creation
• Theory of catastrophism
• Theory of organic evolution
6. ORIGIN OF UNIVERSE
• 20 billion years ago
• Big bang theory
• Tiny particle (no time and space)
• Blast and energy expand
• Helium and hydrogen first atom formed
• Heavier atom formed
• Sun formed
7. Theory of eternity
• Hulton
• Universe of organism are unchangeable
• No beginning no ending
• Law of conservation of mass
• Doubtful, erratic
• Not acceptable
8. Theory of special creation
• Spanish priest: father saurece (1548-1671)
• World 6 days
1. Materia prima
2. Plant ancestor
3. Animals
4. Man
Middle of 19th century: disproved
9. Theory of catastrophism
• Cuvier (162-1832)
• Earthquakes, sudden changes
• Life evolve gain and again
• Proof- Paleontology
10. Theory of organic evolution/naturalistic
• Greek age – 55 yrs. B.C
• Favorable conditions proper (temperature & moisture)
• Organic compound
• Minute molecules
• Multiplication
• Protoplasm
• Ist living thing
• Chlorophyll
• Sunlight
• Food
• Lower plant- algae
• Lower animals- protozoa
• Division of labor
• Structural and functional changes
• Higher animals
• Gradual changes
