When must scientific theories be changed? A. When enough evidence contradicts earlier ideas
B. When an old scientist dies
C. When one experiment shows a surprising result
D. When a new government is elected

Providing immunity by injecting the body with a weakened form a pathogen is known as

Many organs are involved in the processes of keeping the blood and the body clean. when poisonous or harmful substances are in the blood, they are absorbed by the and released in a less harmful form. when wastes are present in the blood, they are filtered out and removed from the body by the

"your temperature analysis reveals a pattern with coldest temperatures located to the portion of the map."