Answer:
Protozoa
Explanation: Malaria is transferred to people by mosquito's. African sleeping sickness is transferred to people by Tsetse. Trichomoniasis is transferred through people. That's why all of these are protozoa. This is the definition of protozoa: is an informal term for a group of single-celled eukaryotes, either free-living or parasitic, which feed on organic matter such as other microorganisms or organic tissues and debris.
• Any organism, which causes disease is known as a pathogen.
• The African sleeping sickness is transmitted by the bite of an insect Tsetse.
• Malaria is the disease transmitted with the help of female Anopheles mosquito.
• Trichomoniasis is a se-xually transmitted disease transmitted by the parasite Trichomonas vagina-lis.
• All the above mentioned diseases are transferred with the help of pathogens that are classified under the class Protozoa.
• These are the single-cell-ed eukaryotes, which are either parasitic or free-living that feed on organic matter.
Thus, the correct answer is option 2, that is, Protozoa.
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