(Question)
Q: Life itself could not exist without what energy, which plays a vital role in photosynthesis? Read this paragraph and choose the correct option from the provided answers: Our lives are filled with light. Through vision, the most valued of our senses, light can evoke spiritual emotions, such as when we view a magnificent sunset or glimpse a rainbow breaking through the clouds. Light can also simply amuse us in a theater, or warn us to stop at an intersection. It has innumerable uses beyond vision. Light can carry telephone signals through glass fibers or cook a meal in a solar oven. Life itself could not exist without light's energy. From photosynthesis in plants to the sun warming a cold-blooded animal, its supply of energy is vital. Choices: - time energy - spin energy - magnetic energy - light energy A:
(Answer)
light energy

(Question)
Q: Do waves move faster when particles are close to each other or far away? Read this paragraph and choose the correct option from the provided answers: The speed of most waves depends on the medium through which they are traveling. Generally, waves travel fastest through solids and slowest through gases. That's because particles are closest together in solids and farthest apart in gases. When particles are farther apart, it takes longer for the energy of the disturbance to pass from particle to particle. Choices: - unaffected - far away - open - close A:
(Answer)
close

(Question)
Q: Why will water balloons launched into the air eventually burst? Read this paragraph and choose the correct option from the provided answers: Each day, hundreds of weather balloons are launched. Made of a synthetic rubber and carrying a box of instruments, the helium-filled balloon rises up into the sky. As it gains altitude, the atmospheric pressure becomes less and the balloon expands. At some point the balloon bursts due to the expansion, the instruments drop (aided by a parachute) to be retrieved and studied for information about the weather. Choices: - heat - momentum - friction - expansion A:
(Answer)
expansion