A: cholera
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Why is it important to control the amount of nitrate fertiliser used on farm land?
On decomposition, which substance in decaying plants is the major source of carbon for carbon dioxide production by t…
Three statements about malarial parasites are listed. 1 Insecticides are used to kill the vectors. 2 Netting is used …
Where does the placenta allow the exchange of materials to take place between mother and fetus?
The genotype for the height of an organism is written as Tt. What conclusion may be drawn?
In a large family, half the children were blood group A and half were blood group B. If the father was blood group O…