12 points! describe the two major types of active transport in cells. .

1. SIMPLE DIFFUSION

Diffusion is the tendency of molecules to spread from regions of high concentration to regions of low concentration.  This movement is due to a concentration gradient.  This is the difference in concentration between two different regions.  An example - when you spray perfume in the corner of a room and eventually you can smell it everywhere.

2. OSMOSIS

Osmosis is the diffusion of water across a selectively permeable membrane from a region of high water concentration to a region of low water concentration.

cancer   is   essentially   uncontrolled   mitosis   of specialized cells