1. 1.1 What is Biology?
Pages 3-10

2. Biology- Greek Word Bios- life Logos- study Means study of life
Learning about living organisms around you

3. Biologists study interactions among living things
No man is an island
We live with other organisms, Ex. E. coli in your intestines help digest your food
Depend on other organisms for living
Ex. Plants give us wheat to eat & Oxygen to breath

4. Characteristics of Life

5. Characteristics of Living Things
Organisms- possess all the characteristics of life
Five characteristics

6. Which are organisms?

7. 1. Living things are organized
All living things have cells
Cells- building blocks of living organisms
Small organisms have one cell (unicellular)

8. Multicellular can exist on tissue, organ, or organ system level
sponge
worm
Big organisms build cells and form tissues, which form organs, which form organ systems (Multicellular)
Multicellular can exist on tissue, organ, or organ system level

11. 2. Living things can reproduce
Reproduction- production of offspring
A species can’t continue if they do not replace themselves
Species- group of organisms that can breed and produce fertile offspring
Ex. Humans are Homo sapiens
4th-whole slide

12. Types of Reproduction Two Types
Sexual Reproduction- two cells from different parents unite to produce the first cell of a new organism
Asexual Reproduction- new organism has a single parent
Usually organism divides in half to form 2 new organisms
Or a portion of an organism splits to form new organism

13. Which type of Reproduction?
                                                          1 2

14. Living things are based on a genetic code
Asexual reproduction results in offspring and parent having identical traits (1 parent)
Sexual Reproduction results in traits varying from parent and offspring (2 parents)
Directions for inheritance are based on DNA (genetic code)

15. 3. Living things change during their life
Growth- increase in the amount of cells and formation of structures (size)
The smaller the organism, the less changes
Development- changes in an organism’s lifetime (structure or function)

17. 4. Organisms adjust to their environment
Ex. Sarah is hot, so she turns on the A/C
She responded to a stimulus
Stimulus- causes an organism to adjust to its environment
Response- reaction to the stimulus
2nd-whole slide

18. Organisms maintain a constant internal environment called homeostasis
Ex. Body temperature 98.6°F

19. Organisms maintain homeostasis with energy
Energy- obtained by food, unit is the Calorie
Organism do work to obtain this food
Plants make their own, animals consume plants or other animals

20. 5. Living things adapt and change over time
Adaptation- organism changing to better survive in their environment
Adaptations are inherited from parents

21. Mimicry
monarch
Viceroy

22. Evolution-simply “change over time”
Adaptation over long periods of time(thousands to millions) of years is called evolution
Evolution-simply “change over time”
A VERY long time!!!