Q: During the winter, production of what amine involved in the sleep-wake cycle may be affected by less sunlight hours? Choices: - serotonin - dopamine - folate - melatonin A:
melatonin

Q: Three-prong plugs, circuit breakers, and gfci outlets are safety features that recognize the danger of what? Choices: - heat - magnetism - gravity - electricity A:
electricity

Q: Q: Insects have a highly specialized type of respiratory system called what? Choices: - nasal system - gland system - grunion system - tracheal system A:
A: tracheal system

Question: Q: The characteristic sound of a motorcycle buzzing by is an example of which effect? Choices: - warp effect - coreolis effect - polar effect - doppler effect A:
Answer: doppler effect

*Question*
Q: What is a group of connected cells that have a similar function within an organism called? Choices: - organ - nucleus - colony - tissue A:
**Answer**
tissue

Q: Acid rain may be caused by what? Choices: - hurricanes - water pollution - volcanos - air pollution A:
air pollution