Microorganisms Are Important to the Carbon Cycle Because, Without Them

question 50

Multiple Choice

Microorganisms are important to the carbon cycle because, without them:

• A)carbon dioxide would not be liberated into the atmosphere for use by autotrophs.
• B)organic carbon in oxygen-free environments could not be cycled.
• C)primary producers would be limited by nitrogen availability.
• D)there would be no chemoautotrophs.

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Definitions:

Postindustrial Period

characterizes the phase in societal development following the peak of industrialization, often marked by a shift towards service-oriented and information-based economies.

Replacement Level

A term used in demography indicating the number of children each woman needs to have to ensure the population size remains constant, typically calculated as slightly over two children per woman.

Fertility Levels

The mean number of offspring a woman has during her life in a certain group of people.

Replacement Level Fertility

The fertility rate at which each new generation precisely replaces itself, without increasing or decreasing the population size.