1. All things considered to be alive have what characteristics in common?  Make a list of reasons why you think the following organisms are considered “alive”.  Team that comes closest wins!!

8. 8 characteristics of living things - Have cells and DNA - Reproduce - Grow and Develop - Use energy - Have a need for materials and energy - Respond to environment - Maintain internal balance - Evolve over time as a species

9. 1. Have cells and DNA  Unicellular  Multi-cellular

10. 1. HAVE CELLS AND DNA  Multi-cellular: cells differentiate from a single fertilized egg cell, and they just “know” to become a heart, leg etc.  Uni-cellular : one celled organism (amoeba or bacteria)  Both above have DNA ( the genetic code: which is why we look like our parents)

11. 2. All living things reproduce  There are 2 ways in which this can be done…

12. Types of reproduction

13. 2. All living things Reproduce  There are 2 types of reproduction:  Asexual : 1 parent (budding) - identical  bacteria  Sexual: 2 parents  cats  people

14. 3. Living things grow and develop  What is the difference between the 2 words?

15. Growth and Development  Bacteria- grow, they just increase in size  People – develop … they increase in size and their bodily functions change over time….until they become an adult  ex) puberty…

16. Living things use energy to grow/develop/reproduce… or just stay alive  Where do we get energy from?  Metabolism: combination of chemical reactions through which an organism builds up and breaks down materials (will release energy) as it carries out life processes  Fast metabolism- break down  Slow metabolism – store for later

17. How obtain energy?  Plants: From the sun’s energy “photosynthesis”  Lion: From eating other organisms “herbivore, carnivore”  Mushroom: From the remains of dead organisms (decomposers)

18. 6. Living things respond to stimuli  http://www.fotosearch.com/video- footage/time-lapse-flower_2.html http://www.fotosearch.com/video- footage/time-lapse-flower_2.html http://www.fotosearch.com/video- footage/time-lapse-flower_2.html

19. 6. Respond to stimulus  Stimulus- signal to which an organism responds  Response- (what they do because of the signal)  Internal stimulus- ex.) sugar levels drop? …then you feel hungry  External: ex.) flower leans toward the window in a classroom

20. Practice Stimulus and Response  My niece kicked me in the shin and I screamed  I slammed the door and the class jumped  I turned the light on and the mouse ran under the table  I placed my hand on the hot stove and I yanked it back and yelped

21. 7. Maintain internal balance  conditions may vary widely  External: conditions may vary widely  …. Should be kept constant.. This is homeostasis  But internal…. Should be kept constant.. This is homeostasis  Ex) temperature 98.6 F, water content, etc  Ex of how it happens?  Shivering/sweating  Thirst/feeling of fullness

22. Evolve over time …

23. 8. Evolve over time :Evolution  100,000’s of millions of years…changes can be dramatic within a species…  ex) pre-historic horse was the size of a Barbie doll horse