Question

fill in the blank question
the double-walled sac enclosing the heart is called the
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Explanation:

In the field of biology (a subfield of Natural Science), the double - walled sac that encloses the heart is a well - known anatomical structure. The pericardium is the double - walled sac that surrounds the heart, providing protection and lubrication for the heart's movement.

Answer:

pericardium