You can easily know the news and weather inradio
the harmful and the beneficial effects of advertising?
putek
M.o.r.e
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it can be food :D
what is the ecosystem
by sex
Sewage treatment
Beneficial Effects - it often leads to creation of new land Harmful Effects - hot molten lava, pyroplastic smoke. Can kill anything below it with ease.
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steroids
It makes the communication easier.