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This question has a two part answer. The first part is that an asteroid hitting the earth and the second part is massive volcanoes erupting around the world.
Answer:
transportation
Explanation:
Transportation (28.2 percent of 2018 greenhouse gas emissions) – The transportation sector generates the largest share of greenhouse gas emissions.
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Answer:
Encloses specific structures.
Explanation:
The plasma membrane, also referred to as the cell membrane, has the job of keeping all the cell structures inside the cell protected and enclosed.