Problem:OPTIONS:
- in warmer waters
- on the ocean floor
- along reefs
- along coasts

Q: Where are the oceans most polluted? A:
****
A: along coasts

Q: While in the lungs, blood gives up carbon dioxide and picks up what element before returning to the heart? A:
OPTIONS:
- nitrogen
- methane
- hydrogen
- oxygen
oxygen

Q: The rate at which an unstable isotope decays is measured in a unit known as what? A:
OPTIONS:
- full-life
- staying-life
- half-time
- half-life

Answer: half-life

Question: Q: Where in the lungs does gas exchange between the air and blood takes place? A:
OPTIONS:
- ganglion
- left lobe
- bronchial tube
- alveoli
Answer: alveoli

input with options: Q: When the number of electrons and the number of protons are equal, the object is what? A:
OPTIONS:
- Negative
- Positive
- static
- neutral
output: neutral

Problem: OPTIONS:
- time
- erosion
- weather
- stress
Q: Q: Mountain building and earthquakes are some of the responses of rocks when subected to what? A:
Answer:
stress