1. Biology is the Study of Li f e  What is life?

2. 1-3 Studying Life  A. Alive or dead ?  Tree alive?  Desk alive?  Cut flower alive?  Is fire alive???

3. Characteristics of all living things  Living things are made up of units called cells.

4. Living Things Reproduce

5. Living things are based on a universal genetic code

6. Living things grow and develop

7. Living things obtain and use materials and energy- METABOLISM

8. Living things respond to their environment- RESPONSIVENESS  http://www.youtube.com/watch?v=O7e QKSf0LmY http://www.youtube.com/watch?v=O7e QKSf0LmY

9. Living things maintain a stable internal condition- HOMEOSTASIS

10. As a group, living things change over time- EVOLUTION

13. Spontaneous Generation  AKA Life from nothing  In 1600s, this was a “hypothesis” for the appearance of living things  http://www.youtube.c om/watch?v=opscES4 eHVU http://www.youtube.c om/watch?v=opscES4 eHVU

14. Francesco Redi 1668  Observed flies on meat  New Hypothesis  Maggots came from flies!  First use of controlled experiment

16. Needham & Spallanzi’s Experiments

17. Pasteur finally proved spontanous generation wrong.

18. Scientific Theory  A tested & supported hypothesis that merges many observations  Natural selection is a theory.  Big Bang is a theory.  http://www.youtube.com/watch?v=e0p04CLd0 gk http://www.youtube.com/watch?v=e0p04CLd0 gk  NOT A FACT  Scientific Theory is Changable.

19. Scientific Law  is a FACT based on repeated observations  law of gravity  energy can neither be created nor destroyed  Gas laws

20. Biology is studied at different levels of organization  Molecular

21. Cellular Level

22. Groups of Cells  Tissues  Organs  Organ systems

23. Organism

24. Population Group of the same type of organisms living in the same area at the same time

25. Community Different populations living in the same area

26. Ecosystem Communities and the non-living surroundings Biotic- Living Factors Abiotic- Non-living Factors

27. Biosphere All of the ecosystems on Earth