1. …this polar bear was bright pink?
What would happen if…
…this polar bear was bright pink?
…this cactus didn’t have spikes?
…this camel didn’t have a hump?

2. Adaptations
Species are adapted to suit their environment Those that are not well adapted to their surroundings will die. Those that are well adapted will survive and reproduce Adaptations are passed on to the next generation This is survival of the fittest

3. Evolution… A gradual change in characteristics of a plant or an animal over time

4. The giraffe – Evolution by natural selection - Charles Darwin

5. Once upon a time…
Giraffes once had variation in neck lengths

6. Giraffes compete to eat leaves from the trees and bushes

7. Over time the leaves start to thin out on the lower branches…

8. …to the point where the short-necked giraffes can no longer reach

9. The short-necked giraffes can no longer eat so die

10. The long-necked giraffes survive and reproduce to pass on their genes

11. The population of giraffes all have long necks
The population of giraffes all have long necks. They have adapted to their environment

12. Your task
Complete the comic strip to describe how giraffes evolved by natural selection (diagrams and descriptions)
Try to use the following key words
Natural selection
Variation
Competition
Genes
Survive
Reproduce
Adaptation

13. Natural selection - Giraffe

14. Your experiment Investigate Darwin’s theory on finches.
Use different types of ‘beaks’ to pick up the food.
How much food does each type of beak pick up in 1 min?
You can only pick up one bead at a time.
You will be in groups of 3
Each person will have a different shape ‘beak’
Each person has to pick up as many bits of food as possible in 1 min
Record the amount of food each beak picked up
Repeat the experiment 3x
Take an average of the results
Draw a graph to show and compare results
Write conclusion about results

15. Beak 1 2 3
Average
Tweezers
Tongs
Spoon

16. Exam question (5 marks)
Natural selection is one of the theories of evolution. State the person whose theory it is, and how it occurs using an example.

17. Exam question
1 mark: (Charles) Darwin 4 marks from the following: Giraffe population has variation in neck length Giraffes with short necks cannot reach branches Giraffes with short necks die Giraffes with long necks survive Giraffes with long necks reproduce Gene for characteristic of long neck passed on to next generation

18. Mimic…
Copying

19. Mimicry
Can be copying the surroundings Can be copying other animals Why would they do that?

20. Copying surroundings

21. Copying other animals

22. Now find the animals in the following pictures…

23. E.g. This is a stick insect

24. You now have to find him!

25. FIND THE FOX

26. WHAT IS HIDING HERE?

30. Which animals mimic?
On your tables create a list of animals that either
Mimic their surroundings
Mimic other animals
Surroundings
Other animals