What is the main idea of the article? From story-Native American history: diversity among the tribes

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.

The principle that the geoglical processes that we see today have occurred through out earths history is called

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 .