Answer
(c) Parasite kills the host
Work Step by Step
The following are the mechanisms used by parasites to evade their host defenses:
1. Causes host’s immune system to make antibodies that cannot react with the parasite’s antigens;
2. Through encystment;
3. Parasite changes its surface antigen faster than the host can make new antibodies;
4. Parasite invades host cells where it is out of the reach of host defense mechanisms.
