Country a: 226 people/sq. mile(physiological density), 8078 people/sq. mile(arable land %) Country b: 84 people/sq. mile(physiological density), 498 people/sq. mile( arable land %)

Which country above has the greater need for food importing, and why?

Apsychologist has developed a series of personality inventories and wants to determine if they are valid. one of the scales measures perfectionism, so he asks a colleague for advice on how to establish the validity of this scale. the colleague tells him that if he were to find a sample of people with personality disorder, these people would obtain high scores on a scale that measures perfectionism.

What were the death camps? who was sent there?

What greek scientist created a screw to move water for irrigation?