Similarly, veins also are tissues that form the principal framework of a leaf or line-markings in marble or rocks.
(veins; also are; tissues that form the principal framework of a leaf or line-markings in marble or rocks) (tissues; form; the principal framework of a leaf or line-markings in marble or rocks)
veins tissues
also are form
tissues that form the principal framework of a leaf or line-markings in marble or rocks
the principal framework of a leaf or line-markings in marble or rocks