Question

homework 5 read and answer molecules are always moving. as they move, they bump into one another. crowded, or concentrated, molecules collide more often. collision cause molecules to push away from one another. over time, as molecules continue colliding and moving apart, they spread evenly throughout the space and become less concentrated. diffusion (dih fyoo zhun) is the process by which molecules move from an area of higher concentration to an area of lower concentration. consider a cell in the lining of your lungs. the cell is in contact with the air that you breathe. the air outside the cell has a higher concentration of oxygen. oxygen moves easily into the cell. the diffusion of oxygen into the cell does not require the cell to use any of its energy. diffusion is a form of passive transport. figure 3 shows how insects use spiracles instead of lungs to get oxygen into their cells. 1. what is diffusion?

Explanation:

Oxygen diffuses into cells as it moves from an area of higher concentration (outside the cell) to an area of lower concentration (inside the cell) without using energy. This is a passive - transport process called diffusion.

Answer:

Oxygen diffuses into cells through passive transport (diffusion) as there is a concentration gradient with higher oxygen outside the cell and lower oxygen inside the cell, and no energy is required for this movement.