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Produces spores (ii) Oxygen and food to take place respiration (©) Pour different amounts of water in each bottle and bio, State any two advantages of chemical changes to the environment. @) Vibrating space determines the pitch of sound. “Rl (a) Respiration enables the body to produce energy Mention any two ways of controlling vectors that breed in water. Water, three empty glass bottles and a table. (a) Rusting improves soil fertility (d) A bottle with highest amount of water produces the marked M, Seeds Helps sailors to determine the depth of water bodies State the function Of the sacs on the plant marked N, (b) i) Mosquitoes// black fly //fresh water snail ponds water produces the lowest pitch. air into each, one at a time. * Name the chemical change that requires; You are provided with the following items: Describe how you can use the items above to show how the size of th Write down any two vectors that breed in water. Fermentation helps in brewing of alcohol (b) amphibian to stay in near by ponds//rearing fish in nearby (i) Water and oxygen to take place rusting State any one way in which sallors benefit from echoes, Draining stagnant water//pouring oil on stagnant Identify the Substance produced from the cone on the piant (03 Marks) © Helps sailors to dodge obstacles on their way water//allowing (b) Put the three bottles on the table. highest pitch while that with the lowest amount of