1. Needs of Living Things

2. Characteristics of Living Things
Cellular Organization
Uses energy
Contain Similar Chemicals
Respond to surroundings
Reproduce
Grow and Develop

3. Cellular Organization
All living things are composed of cells
Unicellular – single-celled organisms (ex. Bacteria)

4. Cellular Organization
Multicellular – organisms that are composed of more than one cell (ex. Humans)

5. Chemicals of Life All living things contain similar chemicals
The most abundant chemical in cells is water

6. Use Energy
All living things use energy to do the things that living things must do (ex. Grow and repair injured parts)

7. Growth and Development
Growth is the process of becoming larger
Development is the process of change that occurs during an organism’s life to produce a more complex organism

8. Response A Response is when a living thing reacts to stimuli
Stimuli is a change in your surroundings

9. Response All living things respond to stimuli
Living things respond in different ways
The ways in which living things respond is called behavior

10. Response Migration to warm places in a response
Hibernation (sleeping) through the winter months is another example

11. Reproduction
Reproduction is the process by which living things produce new organisms (offspring) like themselves.

12. Spontaneous Generation
Spontaneous Generation is the idea that living things come from nonliving things.
Francesco Redi disproved this theory.

13. What Do Living Things Need?
Water
Energy
Living Space
Stable Internal Conditions

14. Water
Plants & animals cannot survive without water

15. Water Water is used to transport stuff through living things
Water is necessary to carry out chemical changes in living things

16. Energy All energy comes from the sun
Autotrophs (organisms that make their own food) get their energy directly from the sun

17. Energy
Heterotrophs (organisms that cannot make their own food) get their energy indirectly from the sun

18. Living Space
Living space includes air, water, sunlight, food, and shelter
Organisms need living space to survive
Organisms compete for living space

19. Stable Internal Conditions
Proper temperature is necessary for living things to carry out life processes
Many living things would die without homeostasis

20. Stable Internal Conditions
Homeostasis is the ability of a living thing to keep conditions inside its body constant

21. Stable Internal Conditions
Homeostasis keeps life processes working even if external temperature changes

22. What are Life Processes?
Life processes are the things an organism must do to stay alive
Living things carry out all life processes

23. Life Processes
Ingestion
Digestion
Respiration
Excretion

24. Life Processes Ingestion Digestion taking in food
breaking food down so it can be used

25. Life Processes Respiration Excretion
using oxygen to get energy from food
Excretion
getting rid of waste