Protists are a diverse and mostly unicellular group of organisms which are eukaryotic. Some protists resemble animal cells, some resemble plant cells and some resemble fungal cells. Protists are very unique, and the methods for preventing their diseases are highly underdeveloped as well as having limited treatments for them. What are the structural features and means of reproduction? Protists can be very small, sometimes even smaller than prokaryotes. All protists have a membrane-bound nucleus and are free-living organisms. Protists have the ability to reproduce both sexually and asexually, like a fungus. The mode of reproduction however is dependent on the environmental conditions present. Protists are highly diverse in terms of structure and their evolutionary history. The replication of protists is further covered for their two specific diseases in other pages, being malaria caused by species in the genus Plasmodium, as well as phytopthora dieback caused by species in the genus Phytophthora.