Answer:
The comparison of a measurement with a known standard, used to determine whether the measurement is reliable. Measurement accuracy is identified as the difference between the measurement of a factor and the accepted value for that factor from a trusted external source, or the percentage by which the two values differ.
Explanation:
The oldest layers are on the bottom, and the youngest layers are on the top.
Mutalism, commensalism, and parasitism
Answer:
either a or d but not to sure
Explanation: