Answer:
a. a set of proteins involved in innate but not acquired immunity.
Explanation:
The complement system are a set of proteins or protein fragments that play a major role in the innate immune system. The complement system is involved in the defense of the body from foreign pathogen through specific plasma proteins that participate in leukocyte activation, chemotaxis and opsonization. In other words, they increase the ability of phagocytes and antibodies to mop up damaged cells and foreign microorganism, activate inflammation process.
Some of these proteins include complement component 3 (C3), complement component 9 (C9) and C1Q complex.
Biodiversity is the different life forms and animals that exist on earth and the biosphere is where all of those life forms and animals live. <span />
What is the feedback loop? i do not have any choices
