What are three main functions of stems?

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

Linda and julia are trying to determine whether their ideas are scientific or pseudoscientific. linda's idea is free of bias. julia's idea gives the same result when tested repeatedly. which statement is correct about linda and julia's idea?

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?