Answer the following question given this paragraph:   Fluid friction occurs in fluids, which are liquids or gases.   Q: What two forms can fluids take?   Choices:  - vapor or gas  - water or gas  - mixture or gas  - liquid or gas  A:
liquid or gas


Answer the following question given this paragraph:   Most aquatic organisms do not have to deal with extremes of temperature or moisture. Instead, their main limiting factors are the availability of sunlight and the concentration of dissolved oxygen and nutrients in the water.   Q: Besides the concentration of dissolve oxygen and nutrients in the water, what other factor limits aquatic organisms?   Choices:  - rainfall  - temperature  - lake size  - availability of sunlight  A:
availability of sunlight


Q: Answer the following question given this paragraph:   Earth itself acts like a gigantic gyroscope. Its angular momentum is along its axis and points at Polaris, the North Star. But Earth is slowly precessing (once in about 26,000 years) due to the torque of the Sun and the Moon on its nonspherical shape.   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:
A: gyroscope


Question: Answer the following question given this paragraph:   A proton is a particle in the nucleus of an atom that has a positive electric charge. All protons are identical. It is the number of protons that gives atoms of different elements their unique properties. Atoms of each type of element have a characteristic number of protons. For example, each atom of carbon has six protons, as you can see in Figure below . No two elements have atoms with the same number of protons.   Q: Which particle of an atom has a positive electric charge?   Choices:  - electron  - nutron  - nucleus  - proton  A:
Answer: proton


*Question*
Answer the following question given this paragraph:   Gas exchange is the movement of oxygen into the blood and carbon dioxide out of the blood.   Q: In gas exchange, oxygen flows into the blood, and what flows out?   Choices:  - naturally dioxide  - carbon monoxide  - liquid dioxide  - carbon dioxide  A:
**Answer**
carbon dioxide


Q: Answer the following question given this paragraph:   Ocean waves are among the most impressive waves in the world. They clearly show that waves transfer energy. In the case of ocean waves, energy is transferred through matter. But some waves, called electromagnetic waves, can transfer energy without traveling through matter. These waves can travel through space. You can read more about electromagnetic waves in the chapter "Electromagnetic Radiation. " Waves that transfer energy through matter are the focus of the present chapter. These waves are called mechanical waves.   Q: What term describes waves that transfer energy through matter?   Choices:  - mechanical currents  - temperature waves  - energy currents  - mechanical waves  A:

A: mechanical waves