*Question*
Answer the following question given this paragraph: A refrigerator must do work to reverse the normal direction of thermal energy flow. Work involves the use of force to move something, and doing work takes energy. In a refrigerator, the energy is usually provided by electricity. You can read in detail in the Figure below how a refrigerator does its work. For an animation of how a refrigerator works, go to this URL: http://www. chemistry. wustl. edu/~edudev/LabTutorials/CourseTutorials/LabTutorials/Thermochem/fridge_movie. html. Q: A refrigerator must do work to reverse the normal direction of what? Choices: - visible energy flow - coolant energy flow - spectral energy flow - thermal energy flow A:
**Answer**
thermal energy flow

*Question*
Answer the following question given this paragraph: Q: What are the two types of vesicle transport called? Choices: - dielectric and exocytosis - epithelium and exocytosis - eptocytosis and exocytosis - endocytosis and exocytosis A:
**Answer**
endocytosis and exocytosis

*Question*
Answer the following question given this paragraph: Which of the following is matter and not matter? 1. the moon 2. an idea for a new invention Answer 1. The moon is matter. The invention itself may be matter, but the idea for it is not. To understand matter and how it changes, we need to be able to describe matter. There are two basic ways to describe matter: physical properties and chemical properties. Physical properties are characteristics that describe matter as it exists. Some of many physical characteristics of matter are shape, color, size, and temperature. An important physical property. Q: Physical properties are characteristics that describe what as it exists? Choices: - imagination - antimatter - life - matter A:
**Answer**
matter

*Question*
Answer the following question given this paragraph: Sending humans to the seafloor is expensive and dangerous. Having to return humans safely to the surface limits what a mission can do. Remotely operated vehicles , or ROVs, allow scientists to study the deep without going to the seafloor. These small vehicles carry cameras and scientific instruments. ROVs were used to study inside the Titanic . This would have been far too dangerous for a manned sub to enter. Scientists control ROVs electronically with sophisticated operating systems. Q: What do scientists use to study the deep without going to the seafloor? Choices: - drill rigs - telescopes - ultrasound machines - remotely operated vehicles A:
**Answer**
remotely operated vehicles