Double-layered sac. the innermost layer of this sac immediately surrounds the heart and is called the pericardium (also called at the base of the heart, this inner layer folds back on itself to become the pericardium. between the layers of this sac is a potential space called the cavity and it is filled with fluid. what is the function of this fluid?
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(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.
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Double-layered sac. the innermost layer of this sac immediately surrounds the heart and is called th...
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