CO₂ Concentrations in the Atmosphere _______ the Past 160,000 Years

question 5

Multiple Choice

CO₂ concentrations in the atmosphere _______ the past 160,000 years.

• A) have been equal to methane for
• B) are higher today than at any time in
• C) have followed the opposite trends of temperature for
• D) have been relatively constant for
• E) have been constant during periods of glaciation over

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Definitions:

Oxygen-demanding Waste

Organic waste material that reduces oxygen levels in water bodies as microorganisms consume oxygen to decompose this waste.

Organic Chemicals

Compounds containing carbon that are found in or produced by living systems.

Thermal Water Pollution

Pollution caused by discharging hot water or industrial effluents into rivers or seas, affecting aquatic life and ecosystems.

Cooling Towers

Structures that remove heat from water or other liquids through the process of evaporation, often used in power plants and industrial facilities.