*Question*
Answer the following question given this paragraph: Ultrasound is sound that has a wave frequency higher than the human ear can detect. It includes all sounds with wave frequencies higher than 20,000 waves per second, or 20,000 hertz (Hz). Q: What do you call sound that has a wave frequency higher than the human ear can detect? Choices: - dynamic sound - supersonic sound - hypersonic sound - ultrasound A:
**Answer**
ultrasound

*Question*
Answer the following question given this paragraph: Sublimation is the process in which a solid changes directly to a gas without going through the liquid state. Solid carbon dioxide is an example of a substance that undergoes sublimation. Q: What is the process in which a solid changes directly to a gas without going through the liquid state called? Choices: - vaporization - amplification - Diffusion - sublimation A:
**Answer**
sublimation

*Question*
Answer the following question given this paragraph: The first organisms were made of only one cell ( Figure below ). The earliest cells were prokaryotes . Prokaryotic cells are surrounded by a cell membrane, but they do not have a nucleus. The cells got their nutrients directly from the water. The cells needed to use these nutrients to live and grow. Q: The earliest cells were called what? Choices: - eukaryotes - carbohydrates - microcytes - prokaryotes A:
**Answer**
prokaryotes

*Question*
Answer the following question given this paragraph: The solubility of gases is also affected by pressure. Pressure is the force pushing against a given area. Increasing the pressure on a gas increases its solubility. Did you ever open a can of soda and notice how it fizzes out of the can? Soda contains dissolved carbon dioxide. Opening the can reduces the pressure on the gas in solution, so it is less soluble. As a result, some of the carbon dioxide comes out of solution and rushes into the air. Q: Increasing the pressure on a gas has what effect on its solubility? Choices: - decrease - halt - slow - increase A:
**Answer**
increase