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Characteristics of Life
10/22/19
Biology
Biology is the science of life
We will study, how living things interact with one another, the history of life, and the role humans in preserving the natural environment
Metabolism
Chemical reactions that take place in only living organisms that help living things function
Ex: grow, reproduce, and make energy
Characteristics of Life
1. Made of one or more cells
2. Displays organization
3. Grows and develops
4. Reproduces
5. Responds to stimuli
6. Has a metabolism
7. Maintains homeostasis
8. Adaptations evolve over time
1. Made of 1 of more Cells
The cell is the basic unit of life
Ameba and paramecium are unicellularorganisms
Ameba
Paramecium
2. Displays Organization
Have structures with specific functions
Ex: Heart – pump blood
Stomach – digest food
3. Grows and Develops
Growth results in increased mass
Development results in different abilities
Ex: getting bigger (growing) learning to crawl then walk (developing)
3. Reproduce
Organisms must be able to pass along traits from one generation to the next
5. Respond to stimuli
Reactions to internal or external stimuli are called responses
Ex: Loud Sound = Scared Class
Stimuli=Loud sound
Response= scared, increased heart rate, scream, jump
6. Requires Energy
Some organisms must take in food
(heterotroph or Consumers) Animals
Some organisms make their own food
(autotroph or producers) Plants
7. Maintain homeostasis
Keep internal conditions stable
Ex: People sweat to keep their body temperature from rising to high
8. Adaptations evolve over
time
Adaptation – inherited changes that occur and help an organism survive
Evolutions involves the changes in an adaptation