I and II only
II, III, and IV
I, II, and III
II and IV
Correct answer is C
- Onchocerciasis, also known as river blindness, is a disease caused by infection by the parasitic worm Onchocerca volvulus.
Symptoms include severe itching, bumps under the skin, and blindness.
The disease is spread by repeated bites from infected black flies and these can be found virtually anywhere there is flowing water to serve as habitat for larvae.
- Schistosomiasis, also known as bilharzia, is a disease caused by parasitic worms.
Infection occurs when your skin comes in contact with contaminated freshwater in which certain types of snails that carry schistosomes live.
- Salmonellosis is an infection with a bacteria called Salmonella. Salmonella live in the intestinal tracts of animals, including birds.
Commonly caused by contaminated food or water.
- Meningitis is an inflammation of the fluid and membranes (meninges) surrounding your brain and spinal cord. The swelling from meningitis typically triggers signs and symptoms such as headache, fever, and a stiff neck.
Some fungal infections are transmitted by airborne dust particles. In addition, other types of meningitis can be transferred to humans by vectors such as mosquitoes
(for example, West Nile virus) or ticks (Lyme disease).
The bacteria that cause meningitis are transmitted from person-to-person through droplets of respiratory or throat secretions from carriers. Close and prolonged contact – such as kissing, sneezing or coughing on someone, or living in close quarters with an infected person, facilitates the spread of the disease.
20%
25%
40%
60%
Correct answer is D
No explanation has been provided for this answer.
northern guinea savanna
southern guinea savanna
tropical desert
montane forest
Correct answer is C
No explanation has been provided for this answer.
nature of substratum
high salinity
high temperature
low pH
Correct answer is A
The most important abiotic factors that organisms have to adapt to are: low oxygen levels and a soft substratum.
A marine protozoan is likely to have no contractile vacuole mainly because the cytoplasm is
isotonic to sea water
hypotonic to sea water
hypertonic to sea water
impervious to sea water
Correct answer is A
No explanation has been provided for this answer.