It depends. They have just listed the books separately and packaged as 5 individual items so it looks like you have to buy 5 things, but you don't.
If you're taking Bio 1a03 also this year, then I would suggest buying the package with both volumes and study guide (the last one on the list) because it will be cheaper instead of buying the books for both courses separately.
So if you buy that one, you would only need to buy the i clicker which would be used for many of your first year courses anyways, and maybe you may need to buy how humans evolved, but wait till after class starts because your prof might decide that you aren't going to use it and so, you wouldn't have to buy that either.