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Reasons why fresh water fishing is more popular than marine fishing in East Africa are;There are enormous fishing grounds e.g. L. Victoria, L Albert, L. Naivasha, L Tanganyika which are accessible to many people.Fresh water fish are popular with high demand among the people encouraging more inland fishing.Fresh water fishing requires simpler methods affordable by majority of fisherman in E. Africa.Most inland fishing ground are rich in Plankton hence encouraging fish breeding.High population in some places such a L. Vitoria offers the much need market.Government support e.g. setting up processing plants ad cooing plants have encouraged more fishing.
Reasons some lakes contain in fresh water are;Presence of outflowing rivers/outlets to drain out excess salts.Some lakes have enough freshwater rivers that drain out excess salts.Some lakes are located in areas with very high rainfall which leads to dissolving accumulated mineral salts.
When Aluminium chloride is dissolved in water the resulting solution has a pH of 3 this is because aluminium chloride hydrolyses in water to form hydrochloric acid which is strongly acidic.
Reason only mutation in genes of a gametes that influence evolution is;Evolution depends on inheritance
It advisable to wipe off any water on the microscope stage during carrying out microscopic procedure so as;To prevent refraction of lightTo prevent wetting the microscope slide