1. The Study of Life Biology is the scientific study of living organisms

2. Characteristics of Life Properties that all organisms share

3. 8 Characteristics of Life 1. made of cells 2. reproduce 3. universal genetic code (DNA) 4. grow and develop 5. take in energy (food) 6. respond to environment 7. maintain internal environment 8. undergo life processes

4. Cells Smallest unit of life Unicellular: one cell – Bacteria Multicellular: many cells humans, animals, plants

5. Reproduction Producing new organisms Asexual: one parent Sexual: two parents

6. Universal genetic code Directions for what traits an offspring will have Carried on DNA

7. Grow and Develop Growth: becoming larger Development: changes during a lifetime Lifespan: period of time an organism lives Life Cycle: all the changes organisms go through during its life span

8. Do organisms always grow and develop at the same rate? When do organisms stop growing and developing? THINK!!

9. Matter and Energy Eating gives materials for growth, development, reproduction Energy comes from chemical reactions from food

10. Response to Environment All living things live in constantly changing environments Must change in order to survive Stimulus: what cause change to occur touch, light/dark, etc. Response: reaction to a change in environment

11. Response to stimuli and adjust to surroundings

12. What happens to the eye?

13. Maintain stable internal environment Organisms keep things internally pretty constant Homeostasis: process of keeping internal conditions relatively stable

14. As a group, living things change over time Evolution: changes that take place over millions of years Individual does not change

15. Life Processes Provides what is needed to survive Ingestion: taking food into the body Digestion: process of breaking down food

16. Life processes Photosynthesis: food-making process; plants Chemosynthesis: chemical energy to make food

17. Life Processes Cellular Respiration – using food to produce energy

18. Life Processes Excretion: removal of waste products Transport: moving nutrients throughout an organism