They will avoid areas where DO levels are below 3 mg/L, but generally do not begin to suffer fatalities due to oxygen depletion until levels fall below 2 mg/L 22. The mean DO levels should remain near 5.5 mg/L for optimum growth and survival Â¹Â².n a stable body of water with no stratification, dissolved oxygen will remain at 100% air saturation. 100% air saturation means that the water is holding as many dissolved gas molecules as it can in equilibrium.
Lesson Summary. 1  Most protist diseases in humans are caused by protozoa. 2  Protozoa make humans sick when they become human parasites. 3  Trypanosoma protozoa cause Chagas disease and sleeping sickness. 4  Giardia protozoa cause giardiasis, and Plasmodium protozoa cause malaria.esson Summary. 1  Most protist diseases in humans are caused by protozoa. 2  Protozoa make humans sick when they become human parasites. 3  Trypanosoma protozoa cause Chagas disease and sleeping sickness. 4  Giardia protozoa cause giardiasis, and Plasmodium protozoa cause malaria.
Some diseases caused by viruses are poliomyelitis, influenza, measles caused by rubeola virus, chikenguniya caused by chikanguniya virus, chickenpox caused by varicella zoster â¦ virus, AIDS caused by human immunodeficiency virus, and the common cold.24 people found this useful.onfidence votes 87. There are many diseases caused by viruses. Some are-chickenpox, measles, influenza, rabies, AIDS, colds, the flu or polio. Rhinovirus (the common cold), Influenza A & B, Rotavirus, HIV, and so many, many more.