1. After scientists have developed a scientific theory (e.g., atomic theory, evolution theory), does the theory ever change? If you believe that scientific theories do not change, explain why. Defend answers with examples.
If you believe that scientific theories do change: Explain why theories change.


lorena group 1
01/25/2011 09:58

if evidence can be found to prove the theory wrong, then the theory is either adapted to the new theory or it is retracted. whoever made the new discoveries must allow his/her peers to judge the new discoveries. theories are not laws and are therefore accepted if a majority allows it.

Group #3
01/25/2011 10:04

We believe that it is possible for scientific theory to change after scientists have already developed a conclusion. Scientific theory's are something that may not be true but people have concluded that it most likely is. They can change because other scientists can develop more studies and experiments. Examples of where theories have changed over time is the conservation of energy which was originally a balance between potential and dynamic energy, but later was expanded to include chemical, heat, light, and mass. Another example is evolution was widly expanded by the discovery of DNA mendelia genetics. Those are examples of where scientific theories have and can for sure change over time and with different experiments.

01/25/2011 10:09

I believe that theories can change because many theories from centuries ago have been proven wrong and have changed. For Example the theory that the earth was expanding has not been proven wrong but has been changed by the plate tectonics theory. Scientist are constantly discovering new things by theories or experiments that change or disprove a theory. So in that case they change.

lorena group 1
01/25/2011 10:14

Also, about the Earth, people used to think that Earth was flat. Although not a truly scientific theory, it was proved wrong by many scientific observations over a period of thousands of years, with evidence compiling and culminating in Apollo 11's images of a spherical Earth

sarah beth group 4
01/25/2011 10:19

Theories do change. Scientific theories are not proven and are not facts therefore, if the theory is disproven, then it changes. For example, the big bang theory says that the universe was created by an explosion. If this theory is proven wrong then the theory is changed

group 5
01/25/2011 10:22

Scientific theories do change they are constantly being revised and resolved as new experiments are done which provide new information that may alter a scientific theories. An example of a scientific theory or idea changing is how Charles Darwin changed the common idea that all organisms were created at the same time in the same area. Darwin came up with the idea that all organisms came from a common ancestor and through his theory of natural selection and his finches on the Galopagos islands he has changed the way that most scientists believe we came to be.

Group 3
01/25/2011 10:30

To Group 5 - Although scientists may have proven the matter of an atom to be accurate, many tests are still be conducted today. Not everything is 100% sure because everything at some point is subject to change. Nothing is certain because tests have over and over again proven things to be just a little off which makes everything off. Just because something is accurate now doesnt mean it will be forever.

Jenna - Group 2 reply
01/26/2011 09:16

I agree with Lorena's post because when someone comes up with a new theory other individuals do have to "judge" it.

Ashleigh Phillips-Group 3
01/26/2011 09:17

to sarah beth :
I completley agree with your statement.It was short,sweet and to the point. Theories are different from laws. So therefore it is changeable.

Austin Group2
01/26/2011 09:30

Calli's comment
All bloggers-
I think we can all agree that theories change and have been proven to do so. The many examples listed above show the support against that argument.


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