Problem: OPTIONS:
- on a tree
- in the air
- Under 32 degrees
- The atmosphere
- patch reefs
- food and shelter
- above ground
- underground
Q: Fact 1: If an animal lives under ground then that animal will be protected from a wild fire. Fact 2: Fire is as elemental a part of the ecosystem as rain. Given the two facts above, an animal living where will be protected from an elemental part of the ecosystem?
Answer: underground

Problem:OPTIONS:
- oil
- sugar
- coal
- Cars
- H2O
- CO 2
- He
- O2

Fact 1: Carbon dioxide concentrations in the air have increased over the last decade dramatically. Fact 2: CO 2 is carbon dioxide. Given the two facts above, what has increased in the air dramatically over the last decade?
****
A: CO 2

Fact 1: Vertebrate chordates have a backbone. Fact 2: Jaws appear within the vertebrates. Given the two facts above, what characteristics do chordates have? ?
OPTIONS:
- arthropods
- aerobic capacity
- annelids
- protozoa
- Veins and arteries.
- backbone and jaw
- sensory neurons
- four limbs
backbone and jaw

Fact 1: Condensing causes a liquid to form. Fact 2: All liquids pour and flow. Given the two facts above, what causes something to form that pours and flows.?
OPTIONS:
- mixing
- rainfall
- Evaporation
- solidifying
- hardening
- condensing
- Heat energy
- blood

Answer: condensing

Question: Fact 1: Plants live just about everywhere on Earth. Fact 2: Epiphytes are plants that live on other plants. Given the two facts above, where do epiphytes live?
OPTIONS:
- swamp vegetation
- mountains
- vegetation
- the environment
- peachleaf willow
- ice
- rocks
- everywhere on earth
Answer: everywhere on earth

input: OPTIONS:
- Pesticides
- neurons
- barnacles
- alpacas
- insects
- fish
- humans
- starfish Now, answer this question: Fact 1: Echinoderms lack a centralized nervous system. Fact 2: Starfish and sea urchins are also echinoderms. Given the two facts above, what lack a centralized nervous system?
A:
output:
starfish