1. Biology = the study of life Bios = life | ology = study of
1.3 Studying Life
Biology = the study of life
Bios = life | ology = study of

2. 8 Characteristics The cell - the smallest unit of life
Unicellular = 1 celled
Multicellular =many celled

3. 2. Reproduction
Sexual = DNA from 2 different parents
Asexual = single parent (cloning, budding)

4. 3. Genetic Code – directions for inheritance (DNA)

5. 4. Growth and Development
Growth = getting larger
Development = changing shape and structure
Differentiation = cells look different and perform different functions

6. 5. Use Energy Metabolism = chemical reactions in the body
Animals eat to obtain energy 
Plants photosynthesize

7. 6. Response to environment
Stimulus = a signal
Response = a reaction

8. 7. Internal Balance 8. Evolution - species change over time
Homeostasis – maintaining constant internal conditions (sameness)
8. Evolution - species change over time

9. Branches of Biology Zoology = animals Paleontology = ancient life
Cytology = cells
Botany = plants
Entomology = insects
You guess…
Microbiology =
Ecology =
Anthropology =

10. Levels of Organization
Molecule
Cell
Tissue
Organ
Organ Systems
Organisms
Population
Community
Ecosystem
Biosphere

11. 1. There are _________ characteristics of life
CHECK FOR UNDERSTANDING
1. There are _________ characteristics of life
2. The smallest unit of life is the ___________
3. All living things must be able to ____________________, or to make more of their own kind.
4. All living things have a _____________________, which are like instructions for building the body
5. During development, some cells become liver cells, some become skin cells and some become muscle cells. This process is called ________________________
6. Animals get their _______________ by consuming food.
Plants get it by __________________________________
7. __________________________ is the maintaining of an internal balance, or sameness
8. ______________________ is the process where species change over time.