The great pacific garbage patch will be difficult to physically clean up because
a. it lies in international waters
b. no single nation is responsible for creating it
c. filtering out theplastic will also remove plankton
d. all of the above

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.