Q: What returns blood from capillaries to an atrium? A:
OPTIONS:
- the lymph system
- arteries
- the liver
- veins

Answer: veins

Question: Q: When menstrual periods become less frequent and finally cease; this is called? A:
OPTIONS:
- climax
- hormonal imbalance
- metabolic
- menopause
Answer: menopause

input with options: Q: What are solutions that maintain a relatively constant ph when an acid or a base is added? A:
OPTIONS:
- gases
- water
- liquids
- buffer
output: buffer

Q: Q: What travels at the interface between the sea surface and the atmosphere? A:

OPTIONS:
- ocean currents
- ocean tides
- ocean breeze
- ocean waves

A: ocean waves

input: OPTIONS:
- nuclei and neutrons
- protons and neutrons
- electrons and neutrons
- protons and electrons Now, answer this question: Q: The chemistry of each element is determined by its number of what? A:
A:
output: protons and electrons

Question: Q: What technique is used by insects and birds to find food, mates, and safety from predators? A:
OPTIONS:
- playing
- sleeping
- mating
- flying
Answer:
flying