The Main Cause of the Increase in the Amount of CO₂

question 52

Multiple Choice

The main cause of the increase in the amount of CO₂ in Earth's atmosphere over the past 150 years is

• A)increased worldwide primary production.
• B)increased worldwide standing crop.
• C)increased absorption of infrared radiation.
• D)increased amounts of fossil fuel burning.

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Definitions:

Degrees of Freedom

The number of values in the final calculation of a statistic that are free to vary, often associated with the sample size.

Two-way ANOVA

A statistical test used to determine the effect of two independent variables on a dependent variable.

Factor A

A specific variable or element considered in an experimental design or analysis, often denoted as a primary independent variable.

Interaction

In statistics and research, the phenomenon where the effect of one variable on an outcome is modified by the level or presence of another variable.