1. Is this biology?

2. Is this biology?

3. Is this biology?

4. Is this biology?

5. Is this biology?

6. Is this biology?

7. Is this biology?

8. Biology Defined: the study of life
Organism: anything that can carry on the processes of life
Species: organisms that can reproduce in breed
Over 2 million species
More diverse along equator
Life has been traced to over 3.5 billion years old

9. Is Fire Alive? no yes yes no yes yes Made of cells 2) Reproduces
3) Grows and Develops
4) Has organization
5) Requires energy
6) Responds to environment no
yes
yes no
yes
yes

10. Are Cars Alive? yes no no yes yes yes Made of cells 2) Reproduces
3) Grows and Develops
4) Has organization
5) Requires energy
6) Responds to environment
yes no no
yes
yes
yes

11. Life Characteristics
All life (from bacteria to humans) has a few common characteristics
1) Based from cells
Cell = most basic unit of life
All cells capable of carrying on life processes
Some cells specialized for specific duties
Ex: Red blood cells carry O2

12. Life Characteristics 2) Requires energy
Energy = ability to do work or cause change
Energy controls metabolism (ability to break down materials)
Most life energy obtained from the sun
Autotrophs: create energy from the sun (ex: plants & algae)
Heterotrophs: consumer others for energy (ex: fungi & animals)

13. Life Characteristics 3) Responds to environment
Stimulus = environmental factors
Ex: Sound, light, touch

14. Life Characteristics 4) Reproduces and develops
Genetic material (DNA) passed to next generation
Asexual reproduction: offspring produced from a single parent
Offspring genetically identical to parent
Sexual reproduction: offspring is a genetic mixture of two parents
Offspring vary genetically from parents

15. Quick Review Life on Earth is very diverse
All life has certain features in common
Energy moves from one organism to another