Based on the following scatter plot, which of the time-series components is not present in this quarterly time series? 
Definitions:
Mass
An estimation of the quantity of matter present in an object, commonly measured in grams or kilograms.
Significant Figures
Significant figures are the digits in a number that carry meaningful contributions to its measurement accuracy, including all the non-zero digits, zeroes between significant digits, and trailing zeros in a decimal.
Mass
A property of a physical body, indicating the amount of matter it contains and a measure of its resistance to acceleration when a force is applied.
Physical Change
Changes affecting the form of a chemical substance, but not its chemical composition, such as melting or freezing.
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