Handwritten letterforms vary between individuals. Every individual has different handwriting.
The reason for the varieties is the different <span>writer's motor control program and the way this motor control program is executed. </span>
<span>The handwriting is determined by the organic factors (physical anatomy and health, mental acuity, etc.) , but also environmental factors effecting the handwriting. These include the writing instrument itself, the writing surface and what lies beneath it, and other variables of the writing situation.</span>
Humans have 23 pairs of chromosomes
The vasa vasorum is a network of small blood vessels that supply the walls of large blood vessels, such as the aorta and vena cava.
<span>Apart from their habitats, Bacteria and Archaea differ in cell wall structure and membrane lipid composition. All bacteria have peptidoglycans in the cell wall whereas the archaea do not. Both also are different in RNA polymerases and thus in their protein synthesis. </span>
