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Red blood cells burst in distilled water but amoeba does not because;Amoeba has contractile vacuoles that absorb excess water and release to the outside environment hence preventing bursting unlike red blood cells
Reasons for continued use of human portage.Seasonal and impassable roads to motorists.Cheap and affordable to use.Rough and steep terrain.Small quantity of goods to transport.Short distances involved.
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.
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.
Fresh water fish cannot survive in marine habitat because they would lose water molecule to the marine habitat since the marine environment is hypertonic.