How many tons of coal, oil, and gas are estimated to exist in the earth

As of December 31, 2016, estimates of total world proved recoverable reserves of coal were about 1,144 billion short tons (or about 1.14 trillion short tons), and five countries had about 75% of the world's proved coal reserves.

Explanation:

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label a.   prophase

label b. metaphase

label c: anaphase

label d: telophase