The value or benefit of something that must be given up to gain something else is known as . The worth or importance of something is its . describes the limited supply of goods, resources, or services. A person who pays for goods or services is a , while a person or group of people who use resources to make goods or provide services is a .

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

7. how did the early egyptians use the flooding of the nile river to their advantage? they diverted the water to flood their enemy's lands and destroy their crops. they created an easier way to travel to the mediterranean sea and the indian ocean. they established a new water-based athletic event for the ancient olympics in greece. they devised an innovative irrigation system, which created a surplus of food.

Those who resisted the mongol invaders were attacked and their towns burned; those who cooperated with them also were attacked and had their towns burned. were treated fairly. were taken into the tribes and treated as mongols. were sent away to find new homes.