The following graph shows the distribution of molecular speeds for CO2 at four different temperatures. Which of the curves corresponds to the lowest temperature? 
Definitions:
Direct Observation
A method of collecting data by watching subjects in their natural (or controlled) environment without manipulating the situation.
Variable Of Interest
The specific quantity or quality that a study aims to measure or examine.
Open-Ended Question
A question format that allows respondents to answer in their own words, as opposed to selecting from a predetermined set of responses.
Experiment
A research method involving the manipulation of one variable to determine its effect on another variable in controlled conditions.
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