*Question*
Q: The pituitary gland is called the "master gland" of what system? Choices: - hormonal - digestive - nervous - endocrine A:
**Answer**
endocrine

*Question*
Q: Microwaves are converted into what kind of energy in a microwave oven? Choices: - solar energy - mechanical energy - light energy - thermal energy A:
**Answer**
thermal energy

*Question*
Q: An electrical motor changes electrical energy into what? Choices: - chemical energy - solar energy - thermal energy - mechanical energy A:
**Answer**
mechanical energy

*Question*
Q: Interactions between plants and other organisms result in cycling of chemical nutrients within what? Choices: - habitat - air - water - ecosystem A:
**Answer**
ecosystem