객관식
Which example best demonstrates the importance of having knowledge of evolutionary relationships?
145
views
1. Introduction to Biology
Natural Selection and Evolution
객관식
Which statement best describes the change in Earth's atmospheric oxygen content as the planet evolved over time?
A
Oxygen was the dominant atmospheric gas before any life appeared.
B
Oxygen levels have always been high since Earth's formation.
C
Oxygen levels increased significantly after the evolution of photosynthetic organisms.
D
Oxygen content steadily decreased as life evolved.
검증된 단계별 안내1
Understand the context of Earth's atmospheric evolution: Early Earth had a reducing atmosphere with very little oxygen, primarily composed of gases like methane, ammonia, and carbon dioxide.
Recognize the role of photosynthetic organisms: Cyanobacteria, which evolved around 2.5 billion years ago, were the first organisms to perform oxygenic photosynthesis, releasing oxygen as a byproduct.
Explain the Great Oxygenation Event: The oxygen produced by cyanobacteria began accumulating in the atmosphere, leading to a significant increase in oxygen levels approximately 2.4 billion years ago.
Discuss the impact of increased oxygen levels: Higher oxygen levels allowed for the evolution of aerobic organisms and more complex life forms, fundamentally changing Earth's biosphere.
Conclude by identifying the correct statement: The statement 'Oxygen levels increased significantly after the evolution of photosynthetic organisms' best describes the change in Earth's atmospheric oxygen content over time.
관련 영상
관련 실천
