Do I need to take a Science class in my senior year of high school?

Colleges recommend 3 years of science, but 4 makes you look like a better rounded applicant. So what is your current schedule? Is it already pretty rigorous without the science? If so, you may not need it. However, I do recommend 4 years of science

Even if you don't major in a type of science in college, you will have to take some science classes in college. So, in high school take biology, it is a useful and interesting science and as an adult you don't want to look like a dummy by not knowing how the natural world works around you.

Take 4, even though you're not planning on majoring in anything science related, science is still important and could be involved in something else you're planning on majoring in whether or not you believe it has to do with Science. Also, you're gonna have to take Science in college anyways so just take a fourth year, try your hardest, and you just might surprise yourself with how much you can accomplish that way in college, science is a bit easier.

You will need to ask your high school as to what are the state's high school credit requirements are. In most states you must have 3 science courses (usually life, biology and chemistry).