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Give two examples of mutualisms involving the transfer of nutrients.
Leukocytes
White blood cells that are part of the immune system, protecting the body against both infectious disease and foreign invaders.
Retroviruses
A group of RNA viruses that insert a DNA copy of their genome into the host cell in order to replicate, e.g., HIV.
Invading Organisms
Pathogens, such as bacteria, viruses, and parasites, that enter the body and cause various diseases or infections.
Antigens
Substances that provoke an immune response, including the production of antibodies, when detected by the body.
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