In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".

[EX Q]: Sound waves are mechanical waves. They can travel only through matter. They cannot travel through empty space. This was demonstrated in the 1600s by a scientist named Robert Boyle. Boyle placed a ticking clock in a sealed glass jar. The clock could be heard ticking through the air and glass of the jar. Then Boyle pumped the air out of the jar. The clock was still running, but the ticking could not be heard. Thats because the sound couldnt travel without air particles to transfer the sound energy. Is there any other place where sound cannot be heard? Here is a hint: is there any other place that does not have air molecules? Thats right, in space sound cannot be transferred. So can astronauts hear each other? Yes, they can, because they are in enclosed space stations or pressurized suits.In both cases, they are surrounded by air molecules. If they left their space ship and did not use their electronics, they would not be able to hear each other. Next time you watch a science fiction movie, think about this factoid. When spaceships are destroyed by hostile alien beings, there would be no sound heard. Sound waves can travel through many kinds of matter. <sep>Can sound waves travel through empty space?<sep>definitely not
[EX A]: Yes

[EX Q]: Breathing is the process of moving air into and out of the lungs. The process depends on a muscle called the diaphragm. This is a large, sheet-like muscle below the lungs. Inhaling, or breathing in, occurs when the diaphragm muscle tightens. This increases the size of the chest. This too decreases air pressure inside the lungs. This action allows air and gases to enter the lungs. Exhaling, or breathing out, occurs when the diaphragm muscle relaxes. This decreases the size of the chest. This increases air pressure inside the lungs. This action allows for air to leave the lungs. When you inhale, air enters the respiratory system through your nose and ends up in your lungs, where gas exchange with the blood takes place. What happens to the air along the way? In the nose, mucus and hairs trap any dust or other particles in the air. The air is also warmed and moistened. Next, air passes through a passageway that is connected to the windpipe. The air then finds its way to the lungs. In the chest, the windpipe splits so that air enters both the right and left lung. <sep>What is happening when your chest increases in size while breathing?<sep>Blows air and gases to enter the lungs
[EX A]: Yes

[EX Q]: After what seemed an eternity to Tibo, they arrived at the mouth of a cave between two rocky hills. The opening was low and narrow. A few saplings bound together with strips of rawhide closed it against stray beasts. Bukawai removed the primitive door and pushed Tibo within. The hyenas, snarling, rushed past him and were lost to view in the blackness of the interior. Bukawai replaced the saplings and seizing Tibo roughly by the arm, dragged him along a narrow, rocky passage. The floor was comparatively smooth, for the dirt which lay thick upon it had been trodden and tramped by many feet until few inequalities remained. The passage was tortuous, and as it was very dark and the walls rough and rocky, Tibo was scratched and bruised from the many bumps he received. Bukawai walked as rapidly through the winding gallery as one would traverse a familiar lane by daylight. He knew every twist and turn as a mother knows the face of her child, and he seemed to be in a hurry. He jerked poor little Tibo possibly a trifle more ruthlessly than necessary even at the pace Bukawai set; but the old witch-doctor, an outcast from the society of man, diseased, shunned, hated, feared, was far from possessing an angelic temper. Nature had given him few of the kindlier characteristics of man, and these few Fate had eradicated entirely. Shrewd, cunning, cruel, vindictive, was Bukawai, the witch-doctor. <sep>Who knew every twist and turn of the gallery?<sep>Bukawai
[EX A]:
Yes

