In the 800s and 900s Europe was underattack, kings could not protect the people, the people had to turn to nobles for protection--this was the beginning of

A) Feudalism

B) Civilization

C) Exploration

D) The Crusades

What is the evidence that depression can be linked to genetic as well as environmental factors? a. all individuals in similar stressful environments do not experience depression. b. all individuals with the gene variation tied to depression do not experience depression. c. individuals with a combination of environmental stress and gene variation are more likely to experience depression d. all of the above select the best answer from the choices provided оа 0 0 0