A controlled scientific test of a hypothesis that often take place in a lab is called?

Helen is a u. s. citizen and cpa, who moved to london, england three years ago to work for a british company. this year, she spent the entire year in london and earned a salary of $110,000. how much of her salary will she be allowed to exclude from gross income in the u. s.

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

Marcy tests a solution with a strip of blue litmus paper. the paper turns red. the solution is acidic basic neutral