Answer:
it is called permissive interaction
Explanation:
(C) earth's outer iron core
this is because iron is magnetic and therefore forms a strong magnetic field
Well, if one of the major species, that a certain animal eat disappeared, then it would effect the animal that ate it. Then, if that animal doesnt get fed, or eat the right things, it will die, and so will the animal that eats it. Its like the domino effect, if one goes down, so does everything else.
~Hoep this helped :)