The Gaseous Oxygen in Earthʹs Early Atmosphere Was a by -Product

question 52

Multiple Choice

The gaseous oxygen in Earthʹs early atmosphere was a by -product of

• A)photochemical reactions breaking down ozone (O₃)to form oxygen (O₂).
• B)volcanic outgassing.
• C)decay of organic matter.
• D)photosynthesis.

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Definitions:

Dependent Variable

The variable in an experiment or study that is expected to change in response to manipulations of the independent variable.

F-Test Statistic

A statistical method employed to assess if two populations have equal variances by comparing the variances of these populations.

Regression Model

A statistical technique used to predict the value of a dependent variable based on the values of one or more independent variables.

Significant

A term used in statistics to denote that a result is not likely to occur by chance alone, and therefore indicates a meaningful difference or relationship.