Peter recently traced his headaches, dizziness, and rapid heartbeat to eating soy food products. Most likely, Peter has a(n) .

Peter has a "soy allergy".

Explanation:

Biochemically, immune system of the people with soy allergy identifies soy proteins as toxic. Therefore, their immune system signals the release of immunoglobulin antibodies. Next time when the person comes in contact with soy proteins, the antibodies recognize them and produce histamine. This release of histamine result into allergic reactions. According to the given conditions in the question, headaches, dizziness, and rapid heartbeat are most likely the result of soy allergy.

chordata is the answer