I would make an assumption and say A.
Answer:a long period of time with severe cold and lots of hard ice
Explanation:
Scientists have recorded five significant ice ages throughout the Earth’s history: the Huronian (2.4-2.1 billion years ago), Cryogenian (850-635 million years ago), Andean-Saharan (460-430 mya), Karoo (360-260 mya) and Quaternary (2.6 mya-present).
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I believe it’s to bring oxygen into the body and to remove carbon dioxide from the body
