a) i) Diffusion
ii) Ions diffuse from highly concentrated region to lowly concentrated region OR ions diffuse along a concentration gradient because sea water contains high concentration of sodium than cell sap
b) i) Iodine ions
ii) Iodine ions taken up by active transport i.e against concentration gradient and this process requires energy delivered from respiration i.e sea water has lower concentration of iodine ions.
johnmulu answered the question on May 1, 2017 at 08:16
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