question: Given the fact "electricity is made of moving charged particles", what is the answer to "Which requires an outlet?"

answer: usb tape player

question: Given the fact "a scar is an acquired characteristic", what is the answer to "An acquired characteristic is"

answer: a jagged raised welt you've had since you fell down the stairs 6 years ago

question: Given the fact "cold environments contain few organisms", what is the answer to "Places lacking warmth have few what"

answer: biological entities

question: Given the fact "a ruler is used for measuring the length of an object", what is the answer to "Harriet wants to know the area of a rectangular sheet of paper. Its size is unknown to her. Which one of these will be the only tool that she needs?"

answer:
a ruler