A toxin or other foreign substance which induces an immune response in the body, especially the production of antibodies.
it is a producer the bottom of the food chain and it is responsible for feeding the smaller fish through making its energy by photosythesis so yes its a producer
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Astronomy is the study of everything in the universe beyond Earth's atmosphere. That includes objects we can see with our naked eyes, like the Sun , the Moon , the planets, and the stars .
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