Final answer:
Plasmodium falciparum is not the only protist known to cause malaria in humans. There are multiple species of Plasmodium that can infect humans, with P. falciparum being the most deadly. It is transmitted by infected mosquitoes, primarily Anopheles gambiae.
Step-by-step explanation:
False. Plasmodium falciparum is not the only protist known to cause malaria in humans. There are four species of Plasmodium that can infect humans - Plasmodium falciparum, Plasmodium ovale, Plasmodium malariae, and Plasmodium vivax. Among these, P. falciparum is the most deadly and accounts for 50 percent of all malaria cases.
It is transmitted to humans by infected mosquitoes, primarily the African mosquito species Anopheles gambiae.