1. Studying Life
Section 1-3: Pages

2. Science that seeks to understand the living world
1. What is Biology?
The study of life
Science that seeks to understand the living world

3. 2. All living things… All living things made of cells
All living things reproduce
All living things are based on the genetic code
All living things grow and develop
All living things obtain and use energy
All living things respond to their environment
All living things maintain a stable internal environment
All living things change over time

4. 3. Mrs. Carey’s Fabulous Four
GROWTH – All living things grow and change over time
REPRODUCTION – All living things must be able to make more of themselves
* All living things must come from other living things!
RESPONSE – All living things respond to stimuli
METABOLISM – All the chemical reactions that take place in an organism (ENERGY)

5. 4. To be considered living…
All living things must have all characteristics of living things
You can not have 3 out of the 4 and be considered living

6. Living or Non-Living

7. Living or Non-Living

8. Basic unit of life! 5. What is a cell?
A CELL is the basic unit of structure and function in an organism.
All living things are made of cells!\
Basic unit of life!

9. 6. Unicellular vs. Multicellular
* Uni means one, so unicellular means organisms made up of only one cell
* Multi means many, so multicellular means organisms made up of many cells

10. Unicellular Protista – One Cell

11. Multicellular – Many Cells

12. 7. Asexual Reproduction Asexual reproduction is where the new organism
has one parent
Asexual reproduction
occurs in both some plants
and animals
Example: HYDRA

13. 8. Sexual Reproduction
Cells from two different parents unite to produce the first cell of the new offspring
There are TWO parents
Example: HUMANS, BIRDS
and CATS

14. 9. Metabolism Any chemical reaction that takes place
The combination of chemical reactions through which an organism builds up or breaks down materials as it carries out its life processes
Examples: Photosynthesis (PLANTS) and Eating fruits and vegetables (ANIMALS)

15. 10. What is a stimulus?
All living things are going to respond to stimuli or changes in their environment
Stimulus: A signal to which an organism responds
Examples: Roots grow down in response to gravity, you sweat when you get too hot and flowers grow towards light.

16. Eye Demonstration
Eye Demonstration: Working with a partner, have one partner shut their eyes and wait 30 seconds. When 30 seconds is up, the partner with their eyes open should watch the partner’s eyes who were closed. What do you notice? Switch roles and do this again.

17. 11. Stimulus: Change in light 12. Response: Pupils dilate
Eye Demonstration
11. Stimulus: Change in light
12. Response: Pupils dilate

18. What is homeostasis?
13. All organisms want to maintain stable internal body environment
14. Example:
* What does your body do when it’s hot?
* What does your body do when it’s cold?

19. 15. What is the main source of energy for all living things?

20. Autotrophs and Heterotrophs
Autotrophs: Organism that has the ability to make its own food.
Example in #15?
Heterotroph: Organism that does not have the ability to make its own food.