Define the following words: - experiment - variable - independent variable - dependent variable - control variable - purpose

Experiment- a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact

Variable: an element, feature, or factor that is liable to vary or change

Independent variable- a variable (often denoted by x) whose variation does not depend on that of another.

dependent variable-a variable (often denoted by y) whose value depends on that of another.

Controlled variable- A variable that you can change

Purpose- the reason for which something is done or created or for which something exists

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."