Question

all worm are harmful to man and his environment. give two reason ?

Answer 1

$\huge \mathfrak{hola \: user}$

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Yes worms are harmful to mans but not to his enviroment because there are some worms who help in soil irrigation and etc....

Roundworms are harmful to humans because they live in soil and stool.. and can enter through mouth or direct contact with skin.
and they live in intestine for a very long time.

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hope it will helps u ^_^