from a cognitive psychology perspective, why is getting plenty of sleep the night before an exam important?

i only have part a but here is the first one: - lewis and clark are born

- lewis marries sacajawea and clark is jealous  

- clark drowns lewis and then goes to jail

answer; protectionism fosters competition and keeps price regulated;

answer; cindy crawford tina feycarrie underwood///meryl streep;

answer; people have no objective standard by which to judge themselves;