Multiple Choice
If an atom has a diploid chromosome number of 78, how many chromosomes would be present in its gametes?
7. Gases
The Ideal Gas Law
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Why was the appearance of oxygen in the atmosphere a crucial event in the history of life?
A
It caused the Earth's temperature to increase significantly, leading to the melting of polar ice caps.
B
It resulted in the formation of the ozone layer, which blocked harmful ultraviolet radiation.
C
It led to the immediate extinction of all anaerobic organisms.
D
It allowed for the development of aerobic respiration, which is more efficient than anaerobic processes.
Verified step by step guidance1
Understand the role of oxygen in the atmosphere: Oxygen is a key element that supports aerobic respiration, a process that is more efficient than anaerobic respiration.
Explore the significance of aerobic respiration: Aerobic respiration allows organisms to produce more energy (ATP) from glucose compared to anaerobic respiration, which is crucial for the development of complex life forms.
Consider the impact on life forms: The presence of oxygen enabled the evolution of aerobic organisms, which could exploit this efficient energy production method, leading to greater biodiversity and complexity.
Examine the environmental changes: Oxygen contributed to the formation of the ozone layer, which protects life on Earth from harmful ultraviolet radiation, further supporting the development of life.
Reflect on the historical context: The appearance of oxygen in the atmosphere marked a pivotal shift in Earth's history, facilitating the transition from simple anaerobic life forms to more complex aerobic organisms.
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