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Why has it been said that only insects ...

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

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a. Phylum Arthopoda is the largest phylum in the animal kingdom and includes insects.
b. Animals of this phylum are highly successful. They dominate terrestrial environments that support human life.
c. Many insects are herbivores feeding on plants that humans use for food , textiles and other industries.
d. These insects act as pests and have an adverse impact on agricultural production , thereby causing economic loss as well as crop loss.
Hence , it is said that insects of this phylum directly compete with humans for food.
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