1. What Does it Mean to Be Alive?
What Are The Characteristics of Life?

2. Exploring LIFE Biology – The study of Life
What does it mean to be ALIVE?
How do you know if something is ALIVE?

3. Is Fire ALIVE?

4. Characteristics of Life!
All living things share some basic properties  Seven Characteristics of Life
E Energy
R  Respond to Stimuli
G  Grow & Develop
R  Reproduction
C  Composed of cells
H  Homeostasis

5. Energy:
All living organisms obtain & use energy to grow, develop, repair damage, and reproduce

6. Living Organisms 1. PRODUCERS: 2. CONSUMERS:
- Plants and other photosynthetic organisms
- Produce their own food (from CO2, H2O, & the sun)
upon which the entire ecosystem depends
2. CONSUMERS:
- Animals:
Obtain nutrients and energy from consuming the food made by producers

7. All Living Things Respond to Their Environment
Example: A plant’s leaves and stems grow toward light
Organisms react to stimuli:
Light
Temperature
Odor
Sound
Gravity
Heat
Water
Pressure

8. ALL ORGANISMS GROW & DEVELOP
Growth & Development
ALL ORGANISMS GROW & DEVELOP

9. All Living Things Grow
Growth means to get bigger in size

10. All Living Things Develop
Development involves a change in the physical form or physiological make-up of an organism

11. All Living Things Reproduce
Reproduction is the process of producing new organisms of the same type
Asexual Reproduction
A single parent organism reproducing by itself

12. Sexual Reproduction
Two different parent organisms contribute genetic information
Involves the combination of male and female sex cells

13. Cellular Organization
Living organisms
Consist of organic molecules  organized to form cells
Cells  Life’s basic units of structure and function
Composed of one or more cells

14. All Living Things are Made Up of Cells
Smallest unit capable of all life functions
Unicellular Organisms
Entire organism is made up of one single cell
Bacteria and protists

15. Multicellular Organisms
The organism is made up of many cells
Cells have specialized functions within the organism

16. All Organisms Maintain Homeostasis
A stable state of conditions in the body that are necessary for life
Body temperature
Blood volume
pH balance
Water balance

17. Living Organisms are Homeostatic
Homeostasis:
Ability of an organism to maintain relatively constant internal conditions
* Example: Temperature regulation in the human body
All organ systems contribute to homeostasis

18. Characteristics of Life!
All living things share 7 basic properties  Seven Characteristics of Life
E Energy
R  Respond to Stimuli
G  Grow & Develop
R  Reproduction
C  Composed of cells
H  Homeostasis
* Discla