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.

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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