The cardiovascular system is made up of the .
*the pumps blood through the
body. the blood is always contained in the .
*this movement of blood is termed ,
the purpose of which is to service the cells by providing oxygen and nutrients
while removing carbon dioxide and other wastes.
*this exchange takes place within
the that surrounds the cells.

not: both offer magnification to the atomic level.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.