is the communication network of blood vessels that begins with the internal carotid arters and vertebral arteries and formas a ring of blood vessels encircling the pituitary gland at the base of the brain

ability to bond woth oxygen

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.