Question: You are presented with the quiz "Solid materials used to produce electricity by burning in what need to be transported firs"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "coal is used to produce electricity by burning in coal-fire power stations" and "solid refined coal is easy to transport and can be used in coal-burning equipment".   So, what's the best answer to the question?
Answer: power stations

Question: You are presented with the quiz "What causes day and night?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aplanet rotating causes cycles of day and night on that planet" and "the gravitational pull of the major planets alters the orbital period from revolution to revolution".   So, what's the best answer to the question?
Answer: Revolution around the sun

Question: You are presented with the quiz "what are cells the microscopic building blocks of?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "cells are the microscopic building blocks of organisms" and "plants are complex organisms".   So, what's the best answer to the question?
Answer: