The most common incorrect description is that the heart is enclosed in a double-layered sac called the pleural membrane. The reality is that the heart is enclosed in a double-layered membrane called the pericardium. The correct layers from out to in are <span>epicardium, myocardium, endocardium </span>
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<h2>I think its 16</h2>
Explanation:
I dont remember Roman numerals that much so I tried it might be wrong I'm not sure
Answer:
I think it's - A chicken learns that if it pecks on a button, a food pellet will be released into its cage.
