PRE-CAMBRIAN EVOLUTION PRESENTATION.pptx

DEVELOPMENTAL BIOLOGY TOPIC NO. 2

1. Presented by Ms. Jolina Macaraeg Pre-Cambrian Evolution: A Journey Through Time Exploring Earth’s Ancient History

2. Key Features of Pre-Cambrian Era The Pre-Cambrian era spans approximately 4 billion years , from Earth's formation to the start of the Cambrian period. Duration of the Era This era saw the emergence of simple unicellular organisms , setting the stage for more complex life forms in later periods. Major Life Forms Geological Changes Significant geological transformations occurred, including the formation of continents and the oxygenation of the atmosphere. 01 02 03

3. Timeline of Major Events in Pre-Cambrian Evolution 4500 Earth forms, initiating billions of years of change. 3500 Prokaryotic life forms appear in ancient oceans. 600 Multicellular life begins to emerge and thrive.

4. Timeline of Evolutionary Milestones 3500 First simple cells appear in Earth's oceans. 1200 Oxygen levels rise, supporting more complex organisms. 600 Multicellular life forms begin to emerge.

5. About Pre-Cambrian Evolution Exploring the origins of life on Earth This presentation investigates key events and milestones in the Pre-Cambrian era, highlighting the emergence of life and evolutionary processes.

6. DEVELOPMENT OF PHOTOSYNTHESIS Early cyanobacteria began converting sunlight into energy. EMERGENCE OF MULTICELLULARITY Simple organisms formed complex structures for cooperative living. RISE OF EUKARYOTES Single-celled organisms evolved into more complex eukaryotic life forms. DIVERSIFICATION OF LIFE Various life forms began thriving in diverse habitats and environments.

7. Stromatolites represent some of the earliest life forms on Earth. These structures, formed by microbial communities , provide crucial insights into the development of early ecosystems and the evolution of life .

8. – Dr. Emily Carter, Evolutionary Biologist “The Pre-Cambrian era set the stage for all future life on Earth.”

9. Timeline of Significant Geological Events 4600 The Earth forms, setting the stage for life. 3800 The first prokaryotic cells appear in the primordial oceans. 540 The Ediacaran biota appears, showcasing diverse life forms. 600 Multicellular life begins to emerge in oceans.

10. The Great Oxidation Event The Great Oxidation Event led to a dramatic increase in atmospheric oxygen, enabling aerobic life to flourish. Rise of Oxygen Levels This oxygen surge allowed for complex organisms to evolve, paving the way for multicellular life. Impact on Life Forms Environmental Changes The increase in oxygen caused significant shifts in Earth's environments, influencing climate and geological processes. 01 02 03

11. The evolution of eukaryotes marks a significant transition in life's complexity. Eukaryotes introduced multicellularity and diverse cellular structures, providing a foundation for complex life forms in subsequent eras.

12. GENETIC VARIATION Genetic mutations create diverse traits within populations. ENVIRONMENTAL PRESSURE Natural selection occurs as organisms adapt to changing environments. SURVIVAL OF THE FITTEST Those with advantageous traits are more likely to survive and reproduce. EVOLUTIONARY CHANGE Over generations, these adaptations lead to significant evolutionary shifts.

13. About Pre-Cambrian Evolution Exploring life's origins on Earth This presentation examines key environmental changes and their role in shaping Pre-Cambrian life on our planet.