1. Scientific Method & Important Scientists

2. Scientific Method Observation: gathering information
Hypothesis: proposed scientific explanation
Experiment: controlled activity to test the hypothesis by changing one variable at a time
Manipulated Variable – deliberately changed
Responding Variable – observed to change in response to the
manipulated variable

3. Sci. Method Cont. Data – information gathered from the experiment
Quantitative: things that can be counted; M-n-M’s
Qualitative: descriptions; blue people, red sky
Theory: well tested explanation for an observation

4. Important Scientists Redi – disproved spontaneous generation
Life cannot arise from nonliving matter
Experiment: flies produce maggots
Leeuwenhoek: created the simple microscope
Saw microorganisms in pond water

5. Imp. Scientists Cont.
Needham – spontaneous generation could occur under the right conditions – heated and sealed gravy and saw activity (incorrect)
Spallanzani: microorganism need air to grow
Experiment: boiled & sealed gravy

6. Imp. Scientists Cont.
Pasteur - all living things come from other living things
Experiment: crocked neck flask
Disproved the idea that air is a life force
Showed infectious diseases were the result of microorganisms entering the body
developed vaccine against anthrax

7. Imp. Scientists Cont. Watson & Crick: structure of DNA
Nobel Prize 1962
Darwin – Father of Evolution
Published On Origin of the Species