1. Redi’s experiment on Spontaneous Generation

3. Development of a Theory
Observation
Inference
Hypothesis
Supported hypothesis
Theory

4. Chapter 1 Section 3: Studying Life
Describe some characteristics of living things
Explain how life can be studied at different levels.

5. Living Things Are Made Up of Cells: some are unicellular (made of one cell) and some are multicellular (made of more than one cell)

6. Living Things Reproduce: either sexually (involving two individuals) or asexually (involving only one individual)

7. Living Things Have DNA (a genetic code)

8. Living Things Grow and Develop

9. Living Things Obtain and Use Materials and Energy

10. Living Things Respond to Their Environment

11. Living Things Maintain an Internal Balance
Homeostasis

12. Living Things Change Over Time

13. The Study of Living Things
Levels (smallest to largest)
Branches
Molecules – smallest level of organization (groups of atoms)
Cells – smallest unit of life (groups of molecules)
Groups of cells- tissues, organs, organ systems
Population – one type of organism in the same area
Community – different populations in the same area
Ecosystem – community and the nonliving factors in that area
Biosphere – the part of the Earth that contains all ecosystems (water, ground, and sky)
Zoologists – study animals
Botanists – study plants
Microbiologists – study microscopic organisms
Ethologists – study animal behavior
Paleontologists – study life in the past
Entomologists – study insects