Explanation:
There are three pathways of complement activation: the classical pathway, which is triggered directly by pathogen or indirectly by antibody binding to the pathogen surface; the MB-lectin pathway; and the alternative pathway, which also provides an amplification loop for the other two pathways.
1. More genetic variation species
2. Children different from parents
3. Able to produce more offspring because of mate
C because nicotine brings down people’s dependence.
Answer: To rule out what it isn't
Explanation: If you have muscle pain, you either have sore muscles, the flu, fibromyalgia, etc...