I believe flagellates would be classified as heterotrophic protists With flagella. It's an animal-like protist.
Answer:
<em><u>carbon dioxide</u></em>
Explanation:
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A volcanic winter is a reduction in global temperatures caused by volcanic ash and droplets of sulfuric acid and water obscuring the Sun and raising Earth's albedo (increasing the reflection of solar radiation) after a large, particularly explosive volcanic eruption.