Answer:
Transport Across Membranes
Transport Without Energy.
Osmosis.
Step-by-step explanation:
Transport Across Membranes. If a cell were a house, the plasma membrane would be walls with windows and doors. Moving...
Transport Without Energy. Passive transport occurs when substances cross the plasma membrane without any input of energy...
Osmosis. Osmosis is a specific type of diffusion; it is the passage of water from a region of high water concentration...
Summary. Controlling the movement of things in and out of the cell is an important role of the plasma membrane.