Q: In an endothermic reaction, what is absorbed by the reaction? Choices: - food - fuel - atoms - energy A:
energy

Q: Oxygen reaches what veinless part of the eye by diffusing through its tear layer? Choices: - retina - pupil - membranes - cornea A:
cornea

Q: Q: What produces sound waves that travel outward in all directions in water? Choices: - echo chamber - ultrasound machines - amplifiers - echo sounders A:
A: echo sounders

Question: Q: Earth acts like a giant version of what device, with angular momentum along its axis and pointing at polaris, the north star? Choices: - compass - telescope - accelerator - gyroscope A:
Answer: gyroscope

*Question*
Q: What form when water vapor condenses in the air around specs of matter? Choices: - humidity - storms - condensation - clouds A:
**Answer**
clouds

(Q).
Q: Most of the energy used by living things comes either directly or indirectly from what? Choices: - plants - the moon - the soil - the sun A:
(A).
the sun