Fact 1: Gases from burning coal and oil dissolving in water in the atmosphere causes acid rain. Fact 2: Acid rain is precipitation which pH is 5.7 or lower. Given the two facts above, gases from what causes precipitation where the pH is 5.7 or lower?

OPTIONS:
- Condensation
- aqueous solution
- streams
- Pollution
- evaporation
- Organic compounds
- vaporization
- burning coal

Answer: burning coal

Fact 1: Reptiles are a class of tetrapod vertebrates that produce amniotic eggs. Fact 2: All lizards are reptiles. Given the two facts above, what produces amniotic eggs?

OPTIONS:
- goats
- crocodiles
- dogs
- sperm
- animals
- sharks
- tortoises
- lizards

Answer: lizards

Fact 1: Brain cells die quickly if their oxygen supply is cut off. Fact 2: Blood carries oxygen to the brain. Given the two facts above, brain cells die quickly if their what supply is cut off?

OPTIONS:
- energy
- breathe
- Energy.
- alveoli
- cut
- CO 2
- loss
- blood

Answer: blood

Fact 1: Cells are the basic units of the structure and function of living things. Fact 2: Tigers are the largest of the living cats. Given the two facts above, cells are the basic units of the structure and function of what?

OPTIONS:
- water
- mammals
- ice
- tigers
- animals
- humans
- plants
- the Sun

Answer:
tigers