When there are a lot of molecules in one place it is considered an area of High concentration.
<h3>What are molecules?</h3>
A molecule is a collection of two or more atoms held together by the attractive forces known as chemical bonds.
The movement of molecules from a region with a high concentration to one with a lower concentration is known as diffusion. Diffusion is the passage of tiny molecules across the cell membrane during cell transport.
Two different kinds of appendages may be found on eukaryotic cells that enable them to move. Flagella are long slender locomotor appendages that are usually single and few in number, whereas cillia are appendages which are numerous and short.
