What is true of dynamic equilibrium?

Dynamic equilibrium is a state in which reactant is converted into products at the same rate. At the beginning of a reaction, the reactants are converted to products and reaction goes into forwarding direction.

But in reversible reaction products start changing into reactants and reaction goes in the reverse direction until an equilibrium is reached. The state where the rates of all the reactants and products become equal and no more changes take place except the concentration is called dynamic equilibrium.

All the changes in dynamic equilibrium cancel out each other and the system seems to be at equilibrium.

a. they are both space stations

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c is the answer because when something is left after something evaporates that shows the chemical change.