Soil
Soil is the upper layer of the ground comprising of a mixture of sand, silt, clay, loose rock fragments, and organic matter that can support the growth of rooted plants. The relative proportions of sand, silt and clay determine the texture and size of the pores of the soil, which affects its ability to allow air and water to penetrate/infiltrate.
Your answer is D. species
B. To explain how things work
Answer:
It is caused by infection with protozoan parasites belonging to the genus Trypanosoma. It is a vector-borne parasitic disease transmited by the Tse-tse fly.
Explanation:
African sleeping sickness, named human African trypanosomiasis, is a vector-borne parasitic disease transmited by the Tse-tse fly (that belongs to the Glossina genus). These flies can acquire the parasite by biting infected humans or animals.
The causative agent is a protozoan of the genus Trypanosoma,
It is caused by infection with protozoan parasites belonging to the genus Trypanosoma. It can be Trypanosoma brucei gambiense or Trypanosoma brucei rhodesiense. Trypanosoma brucei gambiense has a prevalence of 98% of the reported cases, while Trypanosoma brucei gambiense accounts for the 2%.
