Problem: OPTIONS:
- Physical weathering
- saucers
- ice wedging
- alluvial
- animals
- detritus
- aliens
- Wind and rain
Q: Fact 1: Wind and rain cause erosion. Fact 2: Some mountains are caused by erosion. Given the two facts above, what are some mountains caused by?
Answer: Wind and rain

Problem:OPTIONS:
- motility
- sweating
- energy
- cold
- nucleus
- density
- apoptosis
- an object

Fact 1: Phase changes do not change mass. Fact 2: Particles have mass, but mass is energy. Given the two facts above, what property of matter is not changed during a phase change?
****
A: energy

Fact 1: Urine leaves the body through a sphincter in the process of urination. Fact 2: Muscles around the urethra, called sphincter muscles, control the flow of urine out of the body. Given the two facts above, what controls the urination process?
OPTIONS:
- microorganisms
- mechanical waves
- that material's properties
- the looseness of soil
- Muscles around the urethra
- Bones around the urethra
- The brain
- Muscles around the anus
Muscles around the urethra

Fact 1: Poison causes harm to living things. Fact 2: Toxic food poisoning is caused by eating plants that are poisonous. Given the two facts above, toxic food causes harm to what?
OPTIONS:
- Endocrine system
- small stones
- water eaters
- living things
- animals
- organic molecules
- consumers
- toxic plants

Answer: living things

Question: Fact 1: Changes in the pH of soil can cause plants to die. Fact 2: Famines are extreme shortages of food that cause people to die of starvation. Given the two facts above, changes in what can cause extreme shortages of food?
OPTIONS:
- pH of soil
- Dehydration
- climate
- colder weather
- global warming
- salinity
- Time and energy
- Winter
Answer: pH of soil

input: OPTIONS:
- fur and fat
- Fire
- Blankets
- Animal fur
- Head hair
- layers of fat
- Clothes
- copper Now, answer this question: Fact 1: Head hair is especially important in preventing heat loss from the body. Fact 2: Insulation serves to both prevent heat loss in the winter and heat gain in the summer. Given the two facts above, what is a form of natural insulation that humans have?
A:
output:
Head hair