Bee flies that do not have a stinging apparatus are similar in appearance to bees. Explain on the basis of evolutionary theory the occurrence of this type of device.
1) insects of different species have similar mutations in appearance (color, body shape);
2) individuals with signs that enhance their resemblance to protected insects had more opportunities to survive in the struggle for existence;
3) as a result of natural selection, such insects were less likely to be bitten by birds and spread in the population.
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