The prey of one species might also be the predator of another species.

Explanation:

An example is fish that are eaten by seals and the seals are preyed upon by sharks. Seals are the prey of sharks but the predator of fish. This is how energy is transferred in a food web from the primary producers (phototropic organisms) to tertiary consumers.

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2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !