Polly thinks that her father and mother have been replaced by two people who are simply acting as her father and mother. she believes that someone found these people, who look exactly like her parents, and made an exchange. polly's delusion is rare and is called

Use your vocabulary words to complete the sentences below. more of the world's population is now concentrated in heavily populated urban areas known as a this is quite a contrast from the past when or native groups were either farmers or — hunters and gatherers who moved between places in search of food. advanced technology has led to the integration of world economics and cultures, in the world's more developed countries. this integration requires , the responsible use and management of natural resources.

What benefits does this type of farming have?

The process by which liquid water changes into water vapour is called what ?