Which of the following is an example of systematic error?

A scientist misreads a ruler when measuring the length of an insect.

A rainstorm washes away soil in a plot of land where a scientist is testing the effect of a new fertilizer on grass.

A scientist measures the mass of a rock on an older scale that is imprecise.

A scientist spills a foreign chemical into a reaction vessel, changing the reaction.

Question

Which of the following is an example of systematic error?
	
A scientist misreads a ruler when measuring the length of an insect.
 	
A rainstorm washes away soil in a plot of land where a scientist is testing the effect of a new fertilizer on grass.
 	
A scientist measures the mass of a rock on an older scale that is imprecise.
 	
A scientist spills a foreign chemical into a reaction vessel, changing the reaction.

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