input with options: Fact 1: Migration is a type of movement that changes population size. Fact 2: Birds migrate to escape poor weather and food supply. Given the two facts above, escaping poor weather and food supply changes what?
OPTIONS:
- population age
- the environment
- population education
- general preferences
- important habitats
- population size
- movement
- an organism's body
output: population size

input with options: Fact 1: Cells secrete acids and bases to maintain the proper pH for enzymes to work. Fact 2: Enzyme mechanisms Enzymes are biological catalysts. Given the two facts above, for biological catalysts to maintain proper pH, what is needed to maintain proper pH?
OPTIONS:
- Fully cooking the oysters
- raising their temperature
- Organic compounds
- Something made from fermented ricce
- metabolic reaction
- Chemical energy
- Something coming from a gland
- secretion of acids and bases
output: secretion of acids and bases

input with options: Fact 1: Adrought can change the color of an environment from green to brown. Fact 2: Forests are being hurt by the drought. Given the two facts above, what is hurt when the environment changes from green to brown?
OPTIONS:
- animals
- oceans
- humans
- forests
- bushes
- people
- water
- space
output: forests

input with options: Fact 1: Using renewable resources to generate power reduces greenhouse gases. Fact 2: Chlorofluorocarbons are greenhouse gases. Given the two facts above, using renewable resources reduces what?
OPTIONS:
- Heat energy
- energy usage
- massive damage
- chlorofluorocarbons
- direct damage to the lungs
- Temperature
- deforestation
- scarce resources
output:
chlorofluorocarbons