Answer:
the answer is 21 :)
<em>hope this helps</em> ^^
Human activity can affect the river ecosystems because first of all humans take the water and use it for themselves, they also pollute it, disturb the ecosystems and kill fish or oysters etc. in the ecosystems.
Answer:
Consumer: a person or thing that eats or uses something.
Producer: an organism that produces. (makes) its own food.
Explanation:
Hope that helps buddy :)
They are like that because they can't always be faulty and may have at least some spark of truth to this theory also as stated earlier a theory in scientific terms is just an observation so it can't really be turned down hence theory.
