Q: What mammal is the most intelligent? Choices: - dog - monkey - lion - humans A:
humans

Q: What gland is located at the base of the brain and secretes the hormone melatonin? Choices: - thymus - pituitary - thyroid - pineal A:
pineal

Q: Q: Photoautotrophs and chemoautotrophs are two basic types of what? Choices: - plants - consumers - decomposers - autotrophs A:
A: autotrophs

Question: Q: What three forms does frozen precipitation take? Choices: - blizzard, frost, fog - hail, wind, typhoon - vapor, fog, ice - snow, sleet, freezing rain A:
Answer: snow, sleet, freezing rain

*Question*
Q: Which body system releases hormones that act on target cells to regulate development, growth, energy metabolism, reproduction, and many behaviors? Choices: - pituitary - lymphatic - exocrine system - endocrine system A:
**Answer**
endocrine system

*Question*
Q: Electrons are located at fixed distances from the nucleus, what are they called? Choices: - Energy layers - Positive levels - energy concentrations - energy levels A:
**Answer**
energy levels