Its called direct examination
Did you mean the circulatory system?
The circulatory system, also called the cardiovascular system or the vascular system, is an organ system that pumps blood around the body and transport nutrients (such as amino acids and electrolytes), oxygen, carbon dioxide, hormones, and blood cells to and from the cells in the body to provide nourishment and help in fighting diseases, stabilize temperature and pH, and maintain homeostasis.
In 1733 John Kay with a "Flying Shuttle" or in 1765 James Hargreavers with the "Spinning Jenny"
lack of conservation
Lack of conservation is found in the preoperational stage as posited by philospher jean piaget. It is evidenced by lack of differentiating whole and fractional numbers . It often develop in the concrete preoperational stage of 2-7. children can not tell that something remains the same with changes in shape,design, or adjustment of the container.
