(A) Canada balsam is a turpentine made from the resin of the balsam fir tree $(Abies \text{ } balsamea)$.It is a transparent, viscous liquid that is w

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(A) Canada balsam is a turpentine made from the resin of the balsam fir tree $(Abies \text{ } balsamea)$.It is a transparent, viscous liquid that is widely used in microscopy as a mounting medium for preparing permanent slides because its refractive index is similar to that of glass.