Fact 1: Biodiversity increases the productivity and stability of ecosystems. Fact 2: Biodiversity is an incredibly powerful force that keeps species evolving. Given the two facts above, a force that keeps species what increases the productivity and stability of ecosystems?

OPTIONS:
- evolving
- protect them
- recycling
- ligt
- animals
- ferns
- trees
- heat

Answer: evolving

Problem: OPTIONS:
- Gunshots
- An object is seen
- a lightbulb
- ice
- sensory neurons
- a firecracker
- animals
- a stove
Q: Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Hearing is the act of perceiving sound. Given the two facts above, what converts chemical energy into what we hear?
Answer: a firecracker

Problem:OPTIONS:
- energy
- kinetic energy
- Human skin
- sensory neurons
- an object
- deuterostomes
- heat energy
- the skin

Fact 1: The vanes rotating in an electric fan causes air to move. Fact 2: Air speed is an important contributor to cooling of skin temperature. Given the two facts above, what do electric fans cool?
****
A: Human skin

Fact 1: Erosion causes a river to become deeper and wider. Fact 2: Canyon formed as a consequence of river erosion. Given the two facts above, what are formed by erosion?
OPTIONS:
- mountains
- hills
- canyons
- Sediment
- loose soil
- rocks
- soils
- streams
canyons

Fact 1: Soil erosion means soil loss through wind. Fact 2: Hurricanes are made of wind. Given the two facts above, what is soil erosion?
OPTIONS:
- ground to shake
- enormous damage to homes
- movements in the earth's crust
- massive damage
- soil loss through hurricanes
- tectonic plates being pushed together
- fissures of hot, acidic water
- slow and inefficient

Answer: soil loss through hurricanes

input with options: Fact 1: Thick fur can be used for keeping warm. Fact 2: Carpet beetle larvae feed on the keratin and chitin commonly found in wool, fur, or feathers. Given the two facts above, what can be used for keeping warm?
OPTIONS:
- keratin
- vacuum
- four limbs
- energy
- cold
- engines
- magic
- heat
output:
keratin