Question

How can duckweeds be harmful

Answer 1

duckweeds can be harmful because they occupy the surface of water bodies and creates an oxygen deficiency for the aquatic animals who breathe from there.
hope it helps...
pls marj brainliest

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Answer 2

Duckweeds can be harmful because the float on the surface of the water and cover the surface of the water thus causing deficiency of oxygen due to which aquatic animals and plants have difficulty in breathing .