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The aortic semilunar valve prevents blood from flowing backward into the _____.

The respiratory centers are located in the _____.

Edema would be likely to form when _____.

Which two are composed of smooth muscle in the urinary system, and are therefore involuntary?

A cell’s hormonal sensitivities are determined by _____.

A doctor consulting a patient whose gall bladder was recently removed (i.e. cholecystectomy) would likely advise _____.

A person with type A blood has antigen _____ on his/her red blood cells, and _____ antibodies in his/her plasma.

In the second half of this paragraph, Descartes thinks to himself, “there’s no way I’m dreaming right now, my eyes are open and awake, I am moving my head, everything seems so clear and distinct.” But he then remembers what?

The second paragraph (starting with “But it may be that …”) states an objection to the argument from the first paragraph. Which of the following best describes the objection?

The argument is valid. What form does it have?