make correspond or harmonize

a sensory system located in structures of the inner ear that registers the orientation of the head

a chemical reaction and its reverse proceed at equal rates

equality of distribution

a stable situation in which forces cancel one another

make complete or perfect; supply what is wanting or form the complement to

adjust for

make up for

compensate for or counterbalance

balance in flight by regulating the control surfaces

hold or carry in equilibrium

be in equilibrium