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.
Mutations are changes in the DNA of an organism. Examples of beneficial mutations include HIV resistance
<span>A woman's ovary is sixteen times the size of a single sperm. This allows said sperm, or any of its friends, to penetrate the ovary with ease and precision. The ovary will also serve as the home for this sperm during its growth, proving that its larger size has multiple purposes in assisting in sperm growth.</span>
the ice because the albedo value is high
