Answer:
The immune system is made up of special organs, cells and chemicals that fight infection (microbes). The main parts of the immune system are: white blood cells, antibodies, the complement system, the lymphatic system, the spleen, the thymus, and the bone marrow.
Explanation:
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They are both examples of Parasites, because they are feeding of another organism while they are still alive
They resulted from two eggs, each fertilized by a separate sperm