Problem:OPTIONS:
- sunlight
- cold fronts
- heating liquids
- earthquakes
- the moon
- solar eclipse
- a prism
- evaporation

Fact 1: Sunlight and rain can cause a rainbow. Fact 2: Cold fronts bring in the rain. Given the two facts above, what can cause a rainbow?
****
A: cold fronts

Fact 1: The number of rings in a tree trunk can be used to estimate the age of the tree. Fact 2: Tree rings are examined to learn the forest age and growth rate. Given the two facts above, you can determine the growth rate of the forest by examining what?
OPTIONS:
- seasons
- tissue
- bark color
- cycles
- alleles
- radiation level
- rings
- color gradient
rings

Fact 1: Pushing on the pedals of a bike cause that bike to move. Fact 2: Wheels reduce friction with the floor to help cars move. Given the two facts above, pushing on the pedals of a bike cause what?
OPTIONS:
- electromagnetic energy
- Pollution
- friction reduction
- kinetic energy
- decreases its bodily water
- mechanical
- get started
- Heart rate

Answer: friction reduction

Question: Fact 1: Coral reefs provide food and shelter to many ocean organisms. Fact 2: Some fish, like the clownfish, spend most of their lives in and around coral reefs. Given the two facts above, what do clownfish seek shelter in?
OPTIONS:
- coral
- deltas
- alveoli
- burrs
- wetland
- bushes
- keratin
- islands
Answer: coral

input with options: Fact 1: Antigens are molecules that the immune system recognizes as foreign to the body. Fact 2: Molecules are a group of atoms. Given the two facts above, what type of antigens does the immune system recognize as foreign to the body?
OPTIONS:
- animals
- epidermal
- Allergies
- negative
- dangerous
- graptolites
- group of atoms
- homogenous
output: group of atoms

Problem: OPTIONS:
- cloud cover
- Population size
- Pollution
- Pesticides
- rainfall
- risky population
- Climate change
- the environment
Q: Fact 1: Population size influences the chances of a species surviving. Fact 2: Each species lasts for a time, sometimes surviving to the present and sometimes going extinct. Given the two facts above, what influences the chances of going extinct?
Answer:
Population size