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If you did the experiment wrong
The scientific name of Ramapithecus is now considered invalid. It was originally classified as a hominin species, but subsequent research and reclassification have led scientists to view it as more closely related to the orangutan lineage.
Inaccurate data entry.
Inaccurate data entry.
It is important because if the experiment or experimenter is not a very trustworthy person then that often also makes the information he gets from an experiment invalid.
Stronger.
it contains conclusions not explained by the evidence given
it contains conclusions not explained by the evidence given
Chemicals in the lab might contaminate the food - causing poisoning. The food might contaminate an experiment - making the results invalid.
Antarctica's Vostok station is the record holder for the coldest temperature on earth. Vostok is a Russian scientific station. Australia claims a pie-shaped slice of Antarctica, which is an invalid claim based on the Antarctic Treaty. Vostok Station -- a Russian research station, is located in this slice of Antarctica.
.invalid was created in 1999.
The word invalid is an adjective. It describes something that is not valid.