Identify the part of speech of each root word. Then, identify the part of speech after a prefix or suffix has been added to the root.

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.

dr eric sanderson is a character from the book "a world without us". acording to this story dr sanderson's goal is to determine what manhattan island was in the past, before it became a city. sanderson is an ecologist who is interested in the way manhattan looked like in the 17th century.