1. Lecture 1
A Human Perspective

2. Outline Who Are We? and Biological Definition of Life?
Highly Organized
Need energy
Respond to sensory input
Reproduce and Grow
Evolution
Biosphere and Ecosystems
The Process of Science
Scientific Method
Science and Social Responsibility
Technology
Before you begin, it is appropriate to define who humans are and how they fit into the world of living things.

3. Who Are We? Biological Definition of Life
Humans are highly organized.

4. The cell is the fundamental unit of life

5. Need energy/raw materials

6. Biological Definition of Life
“Hierarchy of Life”- Organisms are composed of Organ systems which are composed of organs, composed of tissues, composed of cells.
Cell- the functional unit of life!!! And is highly organized
Humans Maintain homeostasis (Internal Balance) and so do cells.

7. Homeostasis- example body temp

8. Homeostasis

10. Biological definition of life continue
Respond to sensory input
Humans reproduce and grow.- and so do cells
Humans are a product of evolution. And so are cells

11. Evolution
First cells arose about 3.5 billion years ago.
Classification of living things mirror evolutionary relationships.

12. Who Are We?
Humans are members of ecosystems.
Organisms exist in populations that interact among themselves and the physical environment (Atoms/elements).

13. Ecosystems
Planet’s current biodiversity is estimated between 2 and 15 million identified species.
Extinction is the death of a species or other taxonomic group.
Ecosystem preservation is a crucial bioethical issue.

14. Fig. 1.2

15. Fig. 1.2a
Fig. 1.2a

16. Fig. 1.4
Fig. 1.4

17. Terrestrial Ecosystem

18. The Process of Science
The ultimate goal of science is understanding the natural world in terms of scientific theories.
Evolution is the unifying concept of biology.
Some biologists elevate evolution to the status of a scientific principle.

19. The Process of Science
Scientific Method
Observation.
Hypothesis.
Experimentation.
Conclusion.
Support/Fail to support hypothesis.
Hypothesis can never be proven true.
Publish Findings.
Repeatability.

20. Scientific Method

21. Science and Social Responsibility
Technology is the application of scientific knowledge for the needs of society.
Science does not determine whether a particular technology is good or bad.
Responsibility of how to use technology lies with everyone.
Judgments are subject to change.

22. pg.8
Fig. 1.p008

23. Fig. 1.6
Fig. 1.6

24. Fig. 1.7
Fig. 1.7

25. Fig. 1.7a
Fig. 1.7a

26. Fig. 1.7b
Fig. 1.7b

27. Lecture review
Describe the “hierarchy of life”
List the four types of atoms, tissues, and describe the eleven systems of the body.
What is homeostasis and how can it be maintained?
Describe the scientific process known as the scientific method and give an example as we described in class.
List four scientific theories.
What is a control group? And why is it used?