The Oxygen Revolution Changed Earth's Environment Dramatically

question 55

Multiple Choice

The oxygen revolution changed Earth's environment dramatically. Which of the following took advantage of the presence of free oxygen in the oceans and atmosphere?

• A) the evolution of cellular respiration, which used oxygen to help harvest energy from organic molecules
• B) the persistence of some animal groups in anaerobic habitats
• C) the evolution of photosynthetic pigments that protected early algae from the corrosive effects of oxygen
• D) the evolution of chloroplasts after early protists incorporated photosynthetic cyanobacteria

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Definitions:

Precontemplation

A stage in the Transtheoretical Model of Behavior Change where the individual is not yet considering change or unaware of the need to change.

Action

The process of doing something in order to achieve a specific goal or result.

Stages of Change

A concept in psychology that maps out the phases individuals go through as they modify behavior, ranging from precontemplation to maintenance.

Transtheoretical Model

A theory of behavior change that assesses an individual's readiness to act on a new healthier behavior, and provides strategies, or processes of change to guide the individual.