What role did korea have in the development of east asia

What does the word submerged mean in the following sentence? after it rained for three days in a row, the streets were completely submerged.

Food can come from sustainable or unsustainable resources. why has the united nations suggested that bugs could be a better source of food than animals like pigs or cattle?

Match the following items. 1 1 (4,4) 2. (-4,-2) 3. (3.-6) 4. (-4, 6) 5. (1,5)