What do complement proteins do? a. they heal tissue. b. they signal phagocytes. c. they transport hormones. d. they cause fever.

B. They signal phagocytes

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.

Explanation:

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Chief Justice John Marshall administered the presidential oath of office on March 4, 1829 to Andrew Jackson on the East Portico of the Capitol building. In his 34 years as chief justice, Marshall swore in 5 different presidents at 9 inaugurations, a record that stands today.