At the West African Institute for Trypanosomiasis Research Field Station at Ugbobigha was 21·5 per cent.; this species is believed to be of major economic importance because its presence must prevent the keeping of cattle in large areas of potential grazing.
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Trypanosomiasis, both of humans and of livestock, is one of the most important factors restricting economic development in Africa today. The present paper outlines how this disease is limiting agricultural, veterinary and forestry development in the Sudan, Bechuanaland and West Africa.
The present tsetse-fly distribution is reviewed. Glossina palpalis and G. morsitans occur in the south Sudan and G. morsitans in the Ngamiland district of Bechuanaland; G. morsitans, G. palpalis and G. tachinoides are the most important species in West Africa.
These tsetse flies have altered the cattle distribution in all three regions and, in addition to causing widespread disease, have created local overstocking problems in the tsetse-free grazing areas, and have enforced nomadism on breeding herds and economic loss in slaughter cattle along the trade cattle routes in West Africa.
Human trypanosomiasis is not now such an urgent problem and public health measures have led to its control in all three areas.
Increased agricultural development, which can be a successful and economic method of reclaiming land from tsetse flies, must be intensified in all three areas.
Forest conservation policy comes into conflict with tsetse control measures only in West Africa.
Detailed tsetse-fly surveys and research, on which future plans can be firmly based, are now urgently required.
Answer:
Explanation:
Rill erosion is caused by slow movement of water along small channels on bare land with less vegetative cover. Gully erosion creates a deep channels that the surface runoff is further enhanced. The water movement is faster, creating a deeper channels.Apr 16, 2015
Homeostasis, Reproduction, and Metabolism are all the consequence of various organs imparting and arranging in a way that takes into consideration the detail of specific cells to do certain things. Since we have such a variety of organs to do diverse things, the cells can concentrate on doing one capacity rather than one cell doing the greater part of the capacities we can do today. We advanced from single cell creatures into what we are today through a large number of years of adjustment and the passing on of qualities that are the best fit for the earth. Creatures are the consequence of a huge number of years of cooperation from cells to make this extreme being that is us.
Answer:
<em>The correct option is C) Eunice switched the filament and stamen.</em>
Explanation:
The stamen is the main part of the male reproductive system. A stamen comprises of anther and filament. The anther is the part of the stamen which produces the pollen. The pollen are involved in the fertilization of ovules in the female. Hence, the correct option is C.
