Two scientists are cutting samples of leaves for analysis. one scientist always clips a sample from the base of the leaf near the stem, and the other scientist always clips a sample from the tip of the leaf. what kind of error did the two scientist illustrate? a. procedural error b. calibration error c. measurement error d. unit error

Correct A) Procedural error

Procedural error is the error in which while conducting the experiment the  scientist follow a wrong procedure which result in the negative result of the scientific experiment.

Example: While performing a experiment in which heating is required, procedural error occurs when a something is being heated a lid is not put on it, or missing a step, or heating it to a wrong temperature are the procedural error in the experiment which result in the negative result of the experiment.