Question

what is causes the harmful substance and chemical substance reached in a food chain place​

Answer 1

Answer:

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introduction of chemical substance :

Explanation:

Chemical Substance

Chemical substances are known to be involved in the induction of conjugation tubes in Spirogyra (Grote, 1977), and in the processes of cell aggregation and pairing, gametangial formation, and gamete release in Closterium (reviewed in Gerrath, 1993).