D) The AV valves are supported by chordae tendineae so that they do not blow back up into the atria during ventricular contraction.
Answer: The answer should be D .
Explanation:
The sentences that make sense are "Volatile liquids are flammable" and "Liquids burn easily."
well when they were around that was decades and centuries ago so the bones have probably deteriorated from being pushed so far down in the earth
