Do nematodes have a digestive system?

Well if they are living then they will obviously have a brain, but to be honest with you i have never heard of a nematode in my entire life!

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To respond to the above--not every living thing has a brain. For example, protists are unicellular organisms possessing all the qualifications of life, of which having a brain is not included. (Sensitivity to stimuli is a qualification, but you don't need a brain for such responses.) Sponges are also living organisms without a brain. Nematodes have a dense ring of nerves that serves as a "brain" of sorts, though it is not comparable to say a dog's or a human's.