1. Features of Life

2. Biology Defined: the study of life
Organism: anything that can carry on the processes of life
Species: organisms that can create fertile offspring
Over 2 million known species
More diverse along equator
Oldest life (bacteria) = 3.5 billion years old

3. Is this biology?

4. Is this biology?

5. Is this biology?

6. Is this biology?

7. Is this biology?

8. Is this biology?

9. Is this biology?

10. No! Is Fire Alive? no yes yes no yes yes So are fires alive?
Made of cells
2) Reproduces
3) Grows and Develops
4) Has organization
5) Requires energy
6) Responds to environment no
yes
yes no
yes
So are fires alive?
No!
yes

11. No! 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 no no
yes
So are cars alive?
No!
yes
yes

12. Life Characteristics All life has a few common characteristics
1) Made from cells
Cell = most basic unit of life capable of carrying on life processes
Cells are specialized for specific duties
Ex: Red blood cells carry O2

13. Life Characteristics 2) Requires energy
Energy = ability to do work or cause change
Energy controls metabolism (ability to break down materials)
Energy obtained from the sun
Autotrophs: create sugars directly from the sun
Photosynthetic organisms (plants & algae)
Heterotrophs: consumer others for energy
Can’t performs photosynthesis (ex: fungi & animals)

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

15. Life Characteristics 4) Reproduces and develops
Genetic material (DNA) passed to next generation
Types of Reproduction
a) Asexual reproduction:
Genetically identical offspring produced from a single parent
Ex: bacteria, protista, some plants & animals
b) Sexual reproduction:
Offspring is a genetic mixture of two parents
Ex: Most fungi, plants, animals

16. Recap Name 4 features common to all life.
Which type of reproduction creates identical offspring?
In general, which group of life performs photosynthesis to make their own food?
What is the ability to break down food called?
A loud noise or a sharp pain is an example of a _____.
Which type of reproduction creates genetic diversity?