The heart is surrounded by the _____, a double layered sac that protects it and anchors it in place

a. peritoneum
b. perineum
c. pericardium
d. peristalsis
e. periwinkle


ANSWER: c

Biology & Microbiology

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In ________, atmospheric nitrogen is converted to a more usable form for living organisms.

Fill in the blank(s) with the appropriate word(s).

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