Evidences of Evolution- Science 10 Power

Evidences

1. SCIENCE 10 Quarter 4

2. EVIDENCES OF EVOLUTION

3. GROUP ACTIVITY “FROM PAST TO PRESENT”

4. GROUP TASK 1 . Identify the traces found on the source of evidence for evolution assigned in your group. 2. Describe how species evolve using those evidences. 3. Make your output more understandable by making some illustrations or drawings of the evidences you are going to present. 4. Determine what ERA or TIME PERIOD in Earth’s history that species/organism lived. 5 . Present or discuss your output in front of the class using the format given in your activity sheets.

5. GROUP PRESENTATION

6. homotherium

7. SOURCES OF EVIDENCES FOR EVOLUTION

8. SOURCES OF EVIDENCE FOR EVOLUTION 1.FOSSILS 2.COMPARATIVE ANATOMY 3.EMBRYONIC DEVELOPMENT 4.GENETIC INFORMATION

9. FOSSIL EVIDENCE Fossils are the preserved remains or imprints of organisms that lived and died a long time ago.

10. The fossil and the organism in the upper photos are that of a horseshoe crab . Horseshoe crabs are often referred to as “living fossils” for they had been around for 445 million years! Their fossils reveal that they have not changed that much.

11. Archaeopteryx fossil Archaeopteryx Philippine Eagle

12. HOW FOSSILS ARE FORMED? 1.After an organism died, its body is covered with sediment. 2. The meat decomposes therefore it turns into a fossil. 3. The sediments become rock. The skeleton is pressed. 4. The earth’s movements raise the layers of the rocks to the surface. 5. The rock erodes, exposing a fossil.

13. TWO KINDS OF FOSSILS 1. BODY FOSSILS – it is usually the hard parts of the body like bones, teeth, and shells which are fossilized, although traces of skin, feathers and other soft tissues have been found.

14. TWO KINDS OF FOSSILS 2. TRACE FOSSILS – are preserved marks of activity left behind by an organism when it was still alive. This can be a footprint, feces , or even the imprint of an ancient plant.

15. COMPARATIVE ANATOMY This studies the similarities and differences in the structures of organisms. Even if organisms are categorized as different species, there are still similarities in their basic forms.

16. Homologous structures are those body parts that may have different functions but have the same structure which points out to a shared ancestry or common origin.

17. EMBRYONIC DEVELOPMENT An embryo is an unborn individual that is still developing the distinguishing features or characteristics of its species.

18. EMBRYONIC DEVELOPMENT

19. GENETIC INFORMATION The genetic information of related organisms can also give us information of how related they are. The similarities of amino acid sequence in proteins show also similarities in genetic make-up establishing close affinity or relatedness. These could also establish the idea of shared or common ancestry.