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Why has it been said that only insects d...

Why has it been said that only insects directly compete with humans for food?

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(i)The food that insects derive is concerned with human activities. Stored food grains, pulses etc are easily attacked by insects.
(ii)Cockroach eats almost everything that human can have, hence they struggle to achieve it from human beings.
(iii)Agricultural crops get affected by pests which are insects. Human being uses pesticides which affects the pests and their struggle to get food increases.
(iv)Use of mosquito repellents, fly traps make life of such arthropods difficult. Hence, it is said that insects directly compete with humans for food.
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