Question

to reduce the possibility of error, a scientific experiment should not have accurate data more than one variable close observations conclusive evidence

Explanation:

In a scientific experiment, to reduce error, having only one variable (a single - factor experiment) helps isolate the effect being studied. Accurate data, close observations, and conclusive evidence are all positive aspects. Multiple variables can make it hard to determine which variable is causing an observed effect.

Answer:

more than one variable