A food chain is a sequence going from the producers on the bottom to the consumers to the top that shows what consumer eats what
I believe the correct answer from the choices listed above is the last option. The term that would best describe the <span>role of hydrogen gas in the formation of a water molecule would be a reactant. Water has a formula of H2O where it contains water so it should be that hydrogen is a reactant. </span>
This answer is 24 because 2.17 x 10 -8 is 24 so that would be your answer
