if aphid attack walnut tree, is being controlled by biological method by ........ and how ? (a) Wasps (b) Sparrows (c) Ants (d) None
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If aphid attacks walnut tree ,is being controlled by biological method by ants
lahore778:
but the answer of this question that is given in my book is Wasps
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answer is A - wasps is method by which aphid attack walnut tree is being controlled
how?
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