sentence2_structure: A hookworm<>is classified<>as a parasite
sentence1: Yet, there are about 300 types of parasites thriving in America today, including pinworms, tapeworms, hookworms, ringworm's, whipworms roundworrns and microscopic parasites.
sentence2: A hookworm is classified as a parasite.
question: A hookworm is classified as what type of organism?