In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago, the dinosaurs (and over half of all the other species on Earth at that time) died off largely because

Question

BlackTom AI · Accepted Answer

The prompt presents a question about the asteroid impact extinction theory and asks why the dinosaurs and many other species died off around 65 million years ago.
The provided answer option states: 'dust injected into the stratosphere from the impact absorbed visible light from the Sun, causing global temperatures to plummet.'
To analyze this, consider what the asteroid impact would have done: a colossal impact would eject vast quantities of dust and aerosols high into Earth's atmosphere. These particles would scatter and absorb sunlight, reducing the amount of solar energy reaching the surface. This would create a period of global darkness and cooling, known as an impact winter, disrupting photosynthesis, collapsing food chains, and stressing organisms unable to survive prolonged darkness or cold.
The mechanism described in the option aligns with the widely accepted idea that atmospheric particulates blocked sunlight and led to a sharp climate decline, contributing to mass die-offs.
However, since the list of answer choices is not provided in the data, we cannot compare this option against alternatives to identify why this one might be correct or incorrect relative to the others. In a complete multiple-choice setup, you would evaluate each alternative by considering whether it plausibly explains the mass extinction through the physics of sunlight scattering, atmospheric cooling, or ecological cascade effects, and identify any claims that misstate the science (for example, suggesting only local effects, or mischaracterizing the timing or magnitude of cooling).
In summary, the central scientific idea behind the given option is that stratospheric dust and aerosols from the impact blocked sunlight, leading to global cooling and ecological collapse, which is consistent with the general framework of the asteroid impact hypothesis. Without the other options, you cannot assess relative validity, but the described mechanism is a core aspect of the extinction scenario.

In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago, the dinosaurs (and over half of all the other species on Earth at that time) died off largely because单项选择题

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