That question is difficult to answer because you did not specify the interaction other than the descriptive word strong.
the harmful and the beneficial effects of advertising?
putek
M.o.r.e
it can be food :D
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what is the ecosystem
Beneficial Effects - it often leads to creation of new land Harmful Effects - hot molten lava, pyroplastic smoke. Can kill anything below it with ease.
Human-Trees
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penus
steroids
It makes the communication easier.