Answer:
Perceptual set
Explanation:
Perceptual set is the tendency to perceive certain things and ignore others, in this case Jill is known as a 'selector' because she has certain expectations and focuses her attention on the loud children instead of the quiet ones.
Cultural environment, hope this helps ;)
Density is mass per volume 
With data: 
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Hope this helps.
<span>it's quite possible that you'll become ravenously hungry if </span><span>someone stimulates your lateral hypothalamus (option D) On the contrary, if the ventromedial nucleus of your hypothalamus is stimulated, (option A) you are going to lose your appetite.
</span><span>If the lateral hypothalamus is destroyed, you would lose interest in the food. </span>
