(a) State seven ways in which agriculture is important to the economy of West Africa. (b) Give two advantages of each of the following sources of farm power...

(a)  State seven ways in which agriculture is important to the economy of West Africa.

(b)  Give two advantages of each of the following sources of farm power:
(i)    internal combustion engine;
(ii)   electricity;
(iii)  wind.                                                                                                                   

(c)  State five operations in poultry production which could be carried out through the use of
electrical power.