*Question*
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*
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*
Q: Physical properties are characteristics that describe what as it exists? Choices: - imagination - antimatter - life - matter A:
**Answer**
matter

*Question*
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