Give reasons first one to do correct will be marked as brainliest
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bells are made of metal to reflect more sound as non metals are poor reflector of sound
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frictions is produced between interlocking of two surfaces
viruses are dead before entering the body after entering body they obtain living organism's energy and get alive
synthetic fibres melt on heating and catch fire that's why person should not were them
protozoa are heterotrophic because they obtain energy by consuming organic compounds originating from other living organisms
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because they are dependent on others for food
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