Answer:
A cold front is a boundary or zone that separates two air masses. The cooler more dense mass replaces the warmer.
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Explanation:
Alcohol, alcohol is the only liquid since copper and aluminum are a solid ammonia is a bacteria
It protects the cell and allows certain material in and out of the cell
Often, the rock layers bookending the mass extinction are noticeably different in their compositions. These changes in the rocks show the effects of environmental disturbances that triggered the mass extinction and sometimes hint at the catastrophic cause of the extinction
