Answer:
An innate, typically fixed pattern of behavior in animals in response to certain stimuli.
The correct answer is A) the number of electrons that fill the outer shell.
Brady
Ionic bonds are a metal and a non metal bond and a covalent bond is two no metals banded together.
The given balanced reaction is,

The stoichiometric coefficients of each element or compound represents the number of moles of that element or compound required for the complete reaction to take place.
The mole ratios of different products and reactants will be:



So the mole ratio comparing iron (Fe) and oxygen gas (
) is
4 : 3
Solid, Liquid, Gas, and Plasma