Q: What "plumbing" structures inside the veins maintain a unidirectional flow of blood despite the low blood pressure? A:

OPTIONS:
- funnels
- tubes
- pumps
- valves

Answer: valves

Q: Exposure to what is the most common cause of hearing loss? A:

OPTIONS:
- Guitar
- angry sounds
- outside sounds
- loud sounds

Answer: loud sounds

Q: When do homologous chromosomes separate and go to different gametes? A:

OPTIONS:
- during electrolysis
- before meiosis
- after meiosis
- during meiosis

Answer: during meiosis

Q: What is the cause of most ocean waves? A:

OPTIONS:
- tides
- Magnetic pull
- Gravity
- winds

Answer:
winds