1. Characteristics of Life Unity within Diversity

2. What do Biologists do?
Study the diversity of life
Research diseases

3. What do Biologists do?
3. Develop technologies 4. Improve agriculture

4. What do Biologists do?
5. Preserve the environment

5. Response vs. Stimulus
Stimulus: Anything that is part of either environment (internal or external) and causes some sort of reaction by organism.
Response: reaction to a stimulus

6. Response vs. Stimulus Examples
The plant bends toward the light.
An animal is cold so it moves into the sun.
Getting a drink when you are thirsty.
A snake lunges at a rabbit.

7. Living!

8. Non-living!

9. Characteristics of Life
They can be remembered by the mnemonic:
Hog Racer

10. Characteristics of Life
H: Homeostasis
O: Organization
G: Growth and Development
R: Reproduction
A: Adaptations
C: Cells
E: Energy
R: Respond to Stimuli

11. Homeostasis
Maintaining relatively stable internal conditions despite external surroundings
Examples:
Regulating Body Temperatures
Controlling glucose levels in body

12. Organization
Living things are organized

13. Growth and Development
Types of growth:
Cell division
increasing the number of cells
Example: Skin Cells
Cell enlargement
increasing the size of a cell
Example: Muscle Cells

14. Reproduction Production of Offspring Sexual: Involves egg and sperm
Asexual: Cloning, budding, self fertilization

15. Adaptations
Ability to survive in one’s environment

16. Cells Basic building blocks of life Unicellular: One cell
Multicellular: More than one cell

17. Energy Living organisms use energy Autotrophs make their own food
Heterotrophs : depend upon autotrophs for energy

18. Respond to Stimuli
Stimulus creates a response

19. Learning Checkpoint R A C E H O G

20. Misconceptions Senses (see, hear, taste, touch, smell) Uses oxygen
Produces carbon dioxide
Movement
These are NOT necessary in order to be considered alive.