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”.
Group that comes the closest wins…

12. 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

13. 1. Have cells and DNA
Unicellular
Multi-cellular

14. 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)

17. Multi-cellular start off a single cell…

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

19. Types of reproduction

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

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

23. 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…

24. 4. Living things use energy to ……grow/develop/reproduce

25. 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

26. Where are they getting energy from?

27. 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)

28. 6. Living things respond to stimuli

30. 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

31. 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

32. 7. Maintain internal balance

33. 7. Maintain internal balance
External: conditions may vary widely
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

34. Evolve over time …

35. 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