Can someone explain what simple diffusion is and how it is

simple diffusion  Simple diffusion is one of the major types of passive transport The others are facilitated diffusion , filtration, and Simple diffusion can only move material in the direction of a concentration gradient; facilitated diffusion moves materials with and against a concentration

Simple diffusion is defined as the process in which a substance moves through a semipermeable membrane or in a solution without any help from transport proteins Oxygen and carbon dioxide can be transported through simple diffusion as they are small which means they can pass through the phospholipid bilayer They are

This is called internal respiration The actual exchange of gases occurs due to simple diffusion, which means that energy is not required to move oxygen or Unlike simple diffusion where materials pass through a membrane without the help of proteins, in facilitated transport, also called facilitated