Answer: <u>B. They signal phagocytes
</u>
Explanation: Complement proteins are a part of immune system of the body. These are plasma proteins which help in the process of marking and killing the pathogens. These are not involved in the fever causing mechanism, so option D is incorrect. Also, these are not carrier proteins, and are not associated with hormones, thus option C is also incorrect. Since these proteins bind with the pathogens and make them easily recognized by the phagocytes, option B is the right answer.
Mutualism , is the correct answer
An organism's niche includes the type of food it eats, how it obtains its food, and what its predators are. Here is a quizlet website that has more answers to questions like this one: https://quizlet.com/81207203/section-4-2-review-flash-cards/
Your answer is: Niche
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Answer:
you shouldve attached the picture too
