Which describes the “reward pathway” of psychoactive drug use?

Which group of islands is called the land of fire and is located at the southern tip of south america

Restricting immigrants from entering a country may be based on what belief?  

Nami conducts an investigation on plants. she places a grow light on a timer to give the plants different amounts of light to see if this would affect their growth. in this investigation, the amount of light is the .