historical-development-on-the-concept-of-life.pptx

Science

1. Evidence of Life Historical Development on the Concept of Life

2. Historical Development on the Concept of Life Due to their similar characteristics, cells are thought to have descended from a common ancestral cell. Last Universal Common Ancestral (LUCA) Thought to be the common ancestral cell of all cells.

3. Cells Arose from nonliving materials. Over hundred of years, cells from nonliving matter produced subsequent growth, forming cell populations.

4. Cell Population Began to interact with other microbial communities. The interaction led to the evolution of selected cell populations. Adapting to its community, it developed and improved, allowing diversification of the early cell.

5. Origin of Cells Cells appeared on Earth around 3.9 billion years ago. Microorganisms are said to be the earliest life-forms on Earth.

6. Earlier Atmosphere Rich in nitrogen and carbon dioxide. Anoxic (deficient in oxygen) with limited gases present.

7. Anaerobic Microorganisms that were capable of surviving in the absence of oxygen. Includes methanogens (methane-producing organisms).

8. Phototrophic Organisms Light-dependent organisms. Oxygenic and Oxygen-evolving Phototrophs e.g., cyanobacteria Evolved from anoxygenic phototrophs. Slowly oxygenated the atmosphere.

9. Summary of life on Earth through time and origin of the cellular domains

10. ACTIVITY Five members per group. Choose one organism that you think is essential in the historical development of life. Present your report using the pyramid.

11. ACTIVITY The pyramid is divided into Topic (selected organism), Main Idea (general idea about the selected organism), Concepts (at least seven concepts about your organism), Examples (at least three), and Trivia (at least one).

12. Algae Eukaryotic organisms that do not have roots, stems, or leaves but have chlorophyll and other pigments for carrying out photosynthesis. Can be multicellular or unicellular. Classified in seven divisions, of which five are considered to be in the Protista kingdom and two in the Plantae kingdom. Can be microscopic or even as large as 60 meters in length. Diatom Wakame Bladder wrack The oceans cover about 71% of the Earth's surface, yet algae produce more than 71% of the Earth's oxygen; in fact, some scientists believe that algae produce 87% of the world's oxygen.

13. ACTIVITY Organisms: Animals, plants, fungi, bacteria, archaea, protozoa and algae .