Trial and error is when someone tries something and it doesn't work (the error) so they try again (a new trial) and again until they get the experiment right or get the results they want.
Scientists usually think through all possible options, to minimize error. If the results don't come up even with any way of checking, then they know something is wrong. It is highly unlikely, and usually doesn't happen. The more important the experiment, the more time the scientist will spend calculating, and recalculating the possible ways the experiment can occur, or have problems.
A new trial
error
Experimental error.
the answer is: Error
a mistake (aka faliure start again)
A new trial
error
It is simply the scientific method in action. Make a mistake, correct it and go on or start again.
Whatever experiment scientists do, when they make a mistake they obviously need to do the whole experiment again!
Error
redo
the answer is: Error
Experimental error.
a mistake (aka faliure start again)
Error
Scientists often re-do experiments to exclude the chance of an ERROR.
A mistake a scientist makes is called an error. You're probably doing a crossword puzzle. The answer you are looking for should be Error. If the question is Scientists make a mistake, or ______, and need to do an experiment again.? Then you have the answer.