1. TOPIC: Evolution AIM: What evidence supports the theory of evolution?

2. TOPIC: Evolution
AIM: What evidence supports the theory of evolution?
DO NOW: What are fossils? Where do we find them?

3. LARGEST SPIDER FOSSIL:
Named Nephila jurassica, this 165-million-year-old fossil is 2.5 cm in length and has a leg span of almost 9 cm. It is currently the largest known fossilized spider, and is from the family known as Nephilidae, the largest web-weaving spiders alive today.

4. LARGEST ROACH FOSSIL:
Largest-ever complete fossil of a cockroach, one that lived 300 million years ago, 55 million years before the first dinosaurs.
Among features visible in the 3.5-inch long cockroach are veins in the insect's wings, and fine bumps covering the wing surface. The roach's legs and antennae, folded around its body, are also evident, as well as mouth parts.

5. Change of an organism through time
Evolution
Change of an organism through time

7. Earth= 4.5 billion years old
Geologic
Time
Scale
History of life
Earth= 4.5 billion years old

10. Evidence
for
Evolution
1. Fossils
trace or remains of an organism

11. Bones

12. Imprint = impression in mud  hardens into rock

13. Mold = shape preserved in rock as hollow form

14. Cast = mold filled with minerals and hardens

15. PETRIFIED MOLD
CAST

16. Petrifaction = remains turn to stone

17. a. Homologous structures =
2. Anatomical Evidence
Similarities in structure
a. Homologous structures =
Parts of different organisms have similar structures, but used for different functions

19. 3. Embryological Evidence =
Similarities in early embryos suggest they all came from a common ancestor

20. FISH
REPTILE
BIRD (chicken)
MAMMAL (human)

21. 4. Biochemical similarities =
Similar DNA, proteins (hormones, enzymes…)
Suggest common ancestry

22. Where are fossils found? Layers of sedimentary rock
Law of Superposition =
older fossils/rocks in lower layers, younger ones in upper layers

23. youngest
oldest

24. youngest
oldest

25. Fossil Record Record of organisms that lived in past
Incomplete (gaps), bc not all turn into fossils