Civil wars, political unrest and natural disasters have contributed to a large amount of [blank]

A) Food shortages
B) Trade wars
C) Refugees
D) Border disputes

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In the developed world, women are increasingly more likely to delay childbirth until their mid- to late- twenties or long because

Why is the huronian supergroup rock formation particularly interesting to scientists? because it looks like a cross-section of a giant, stone encyclopedia because it formed during the period when oxygen began to accumulate in the atmosphere because it contains unusually large amounts of oxygen and sulfur because it dramatically altered the planet's development when it first formed