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This actually depends upon the particular kind of experiment you were doing, but many science experiments involve chemicals that you would not want to get into your food by accident. If it was a biological experiment, there could be dangerous germs involved.
In gymnastics you will need to have an experiment for gymnastics when you are doing a research
There are no serious/significant risks involved in the experiment.
A purpose is why u are doing an experiment
It depends, if you are doing an experiment on temperatures of water in nature, you will need it. If you are doing an experiment on how fast different species of turtles can walk, you don't.
it means you made a mistake
It depends on the experiment and how old you are
After doing the experiment or the project, what can you conclude, or what can you say about it or summarize after looking at the data or experiment.
Neither. You aren't really doing an experiment.
You can make cool science experiments by doing what you should do for the experiment, if your doing volcanoes research them and make a model something you will enjoy.
Try doing a science experiment.
Some science experiments involve substances that would be dangerous to get in your eyes.