Which of the following is not a reason that humans genetically engineer trees

A] Emulsification - emulsification is the process of breaking down fat into smaller droplets which makes it easy for digestion.

B] Peristalsis - waves of muscular contraction that pushes food along the gut.

C] Absorption - process in which substances are taken in.

D] Assimilation - the process of absorbing minerals and other chemicals from food, usually for growth and repair of cells.