What indicates the total number of molecules of an element or compound in a chemical equation? (the numbers in front of the chemical formula or chemical symbol) 2FeO3+3C>4Fe+3CO2

It is
A. Coefficients
B. Products
C. Reactancts
D. Subscripts

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

Ineed to find the answer of this question because i dont understand it

When the mercury level in a barometer decreases that atmospheric pressure has