Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
14 Cards in this Set
- Front
- Back
|
Scientific Method
|
-steps we use to solve a problem - Steps: - State the Problem, Gather Information, Form a Hypothesis, Perform an Experiment, Analyze Data, Draw Conclusions- if hypothesis is supported: Repeat many times- if hypothesis is not supported: revise hypothesis |
|
|
Observation vs. Inference
|
Observation- information you gather using your senses Inference- information you gather using observations and past knowledge |
|
|
Hypothesis
|
*proposed answer to question *has to be able to be proven wrong * has to be testable |
|
|
Theory
|
*more generalized *supported *explanation of how things work without explaining why *result of many observations and experiments *data or information from new expiraments might change conclusions and the theory can change
|
|
|
Law
|
*a statement about how things work in nature that seem to be true all the time *can be modified as more information becomes known *less likely to change than theories *will tell you what will happen under certain conditions- don't really explain why |
|
|
spontaneous generation and biogenesis
|
sg- living things can come from non-living things bg- living things only come from living things |
|
|
Redi (16680)
|
-put decaying meat in jars - covered half of the jars - fly maggots only appeared on uncovered meat - concluded the flies did not come from the meat - supported biogenesis |
|
|
Needham
|
-heated broth in sealed flasks -broth became cloudy with microorganisms -mistakenly concluded that they developed from the broth -supported spontaneous generation |
|
|
Spallanzani
|
-boiled broth for a longer time than Needham did -only ones he opened became cloudy with contamination - supports |
|
|
Pasteur
|
-boiled broth in s-necked flasks that were open to the air - broth only became cloudy when the flask was tilted and the broth was exposed to dust in the s-neck |
|
|
Oparin
|
-hypothesized that energy from the sun, lightning, and Earth's heat triggered chemical reactions early in Earth's History - the newly formed molecules washed in to the Earth's ancient oceans and became part of the primordial soup |
|
|
Miller and Urey
|
- tested Oparin's hypothesis - sent electric currents through a mixture of gases like those though to be in Earth's early atmosphere - when gases cooled , they condensed into an ocean like liquid that contained materials found in present day cells -showed chemicals found in living things could be produced, did not prove that life began this way |
|
|
Dichotomous Key
|
|
|
|
Apply Scientific Method to real life problem
|
|
