Cell transport is useful because it's, essentially, the movement of cells across the blood/veins. Active transport uses energy, while passive transport does not.
Folds exhibit DUCTILE deformation. Folds are bent like pattern formed on the upper crust of the rocks. In simple words, folds are bend in rock strata. These are ductile deformation in the rock strata. These are results of compressional stresses on the rocks. Folds are of two types anticlines and synclines.
The answer is A. Hope this helps you out.
