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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Endosymbiosis explains the origin of the ________ of eukaryotes
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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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