Which statement describes an effect of large astroid and comet impact

it's first because I know

The correct answer D. They may kick up dust and pollute Earth's atmosphere.

explanation:

The impact of a large asteroid or comet is a major event that leads to major changes in ecosystems. One of the effects that can be expected is an important increase in dust because one of the components of asteroids and comets is dust, which would be released during the impact. Also, this dust might interact with components from the soil and the atmosphere creating a cloud, acting as a pollutant. According to this, the expected effect is "They may kick up dust and pollute Earth's atmosphere"

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21 stacks

step-by-step explanation:

divide 630/30

21 stacks

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds