Multiple Choice
In the process of photosynthesis, which of the following are the correct products and reactants?
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Why was the evolution of cyanobacteria such a significant event in Earth's history?
A
Cyanobacteria were the first organisms to utilize sulfur compounds for energy, leading to the formation of sulfuric acid in the oceans.
B
Cyanobacteria were the first organisms to develop a nucleus, marking the beginning of eukaryotic life.
C
Cyanobacteria were the first organisms to colonize land, leading to the development of terrestrial ecosystems.
D
Cyanobacteria were the first organisms to perform oxygenic photosynthesis, leading to the oxygenation of Earth's atmosphere.
Verified step by step guidance1
Understand the role of cyanobacteria in Earth's history: Cyanobacteria are known for being the first organisms to perform oxygenic photosynthesis, which is the process of converting carbon dioxide and water into glucose and oxygen using sunlight.
Recognize the significance of oxygenic photosynthesis: This process was crucial because it led to the production of oxygen as a byproduct, which gradually accumulated in Earth's atmosphere.
Consider the impact on Earth's atmosphere: The increase in atmospheric oxygen, known as the Great Oxidation Event, dramatically changed the composition of the atmosphere, making it possible for aerobic (oxygen-breathing) organisms to evolve.
Acknowledge the broader ecological impact: The oxygenation of the atmosphere allowed for the development of more complex life forms and ecosystems, eventually leading to the diversity of life we see today.
Differentiate from other options: While cyanobacteria did not utilize sulfur compounds for energy, develop a nucleus, or colonize land first, their ability to perform oxygenic photosynthesis was the key event that led to significant changes in Earth's environment.
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