Science Essay

CELL guess nonES The Scientific Method 1. Make card 2. Ask a Question 3. Form a system (possible explanation) 4. Set up a Controlled Experiment that tests only 1 variable Variable factors in try that can modification (ex: temperature, time, oxygen levels, light) 5. Record/Analyze results 6. Make conclusions from results 7. Retest unbidden genesis (S.G.) The idea that life story things can bring from non- vivacious things The hobbyhorse scientists used the scientific method to test the theory of spontaneously contemporaries: Redi, Needham, Spallanzani, & Pasteur Redi o Covered jar of meat o Results: No Maggots/Flies o Conclusion: S.G. does NOT happen, center of attention doesnt Make flies physical contact to Redi scare Animation http://www.sumanasinc.com/web guinea pig/animations/content/scientificmethod.html Needham ? boil farm animal shortly time until clear ? Results: age later bacteria appeargond in gravy ? Conclusions: - intuitive Generation CAN happen, Bacteria made from livestock ? Mistakes: Didnt travail long enough & every(prenominal)owed air (with bacteria) to get in Spallanzani ? sulk broth LONG time & Sealed Jar ? Results: old age later until now NO bacteria ? Conclusions: Broth does NOT make bacteria, S.G. does NOT happen ? Critics said... you lead air for Spontaneous Generation.

CELL THEORY NOTES Pasteur ? use swan-necked flask so air can get to broth ? Boiled broth for long time ? Microbes got stuck in bend ? Results: No microbes appeared in broth ? Conclusions: o broth does NOT make bacteria o S.G. does NOT ha ppen o All living things must come from oth! er living things! Link to Pasteurs Experiment Flash Animation http://bcs.whfreeman.com/thelifewire8e/content/cat_010/0304003.html CELL THEORY 1. All living things are made of cells 2. Cells are the staple fiber functional unit of all living things 3. All cells come from existing cells LEEUWENHOEK 1st to see living cells motto in pond water ROBERT HOOKE Used light microscope to discover cells real saw...If you want to get a full essay, order it on our website: BestEssayCheap.com

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