Question

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Answer 1

1.some sounds are made to make people aware of danger or in case of an emergency. these are called warning sounds. eg:-fire alarm,ambulance siren,etc..,

2.the primary sources of energy in the environment include fuel like coal,oil natural gas uranium and biomas.all primary source fuels except biomass are nonrenewable.primary sources also include renewable source such as sunlight, wind,moving water and geothermal energy.