Problem:OPTIONS:
- Earth revolving around the sun
- The area was once underwater
- gastropod shells
- it keeps an organism warm
- remains of prehistoric life
- fertilization occurs
- allow growth
- It helps them survive

Fact 1: Fertilization occurs when sperm swim to an egg inside an archegonium. Fact 2: Each archegonium contains a single egg that is embedded in the prothallus. Given the two facts above, what happens inside the single egg embedded inside the prothallus ?
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A: fertilization occurs

Problem:OPTIONS:
- DDT
- UV
- methane
- tar
- CFCs
- vapor
- SO2
- carbon dioxide

Fact 1: Lung cancer is most often caused by exposure to tobacco smoke. Fact 2: Tobacco smoke contains tar. Given the two facts above, lung cancer is most often caused by exposure to?
****
A: tar

Problem:OPTIONS:
- animals
- pupil
- contact lens
- touch
- Man
- bats
- photons
- sight

Fact 1: Sight is the ability to sense light, and the eye is the organ that senses light. Fact 2: Light enters the eye and forms images. Given the two facts above, what is the ability to see images via the eye?
****
A: sight

Problem:OPTIONS:
- hyperthyroidism
- lowered energy cost
- harmful substances
- Heart rate
- good visibility
- It gets heated up
- Pollution
- rainfall

Fact 1: High pressure systems cause clear weather. Fact 2: Weather Clear weather usually means good visibility. Given the two facts above, what does a high pressure system cause?
****
A:
good visibility