which example is not a structural adaptation of animals?
a) a seal's thick fat to keep it from freezing
b) wings on a bird to get food and escape predators
c) a tortoise shell to protect from predators
d) gosling's following their mother to stay protected

D

Explanation:

This would be a behavioral adaptation I believe , it's not a feature they were physically born with.

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 !

1.solid

2.carbon dioxide

3.helium