Problem: OPTIONS:
- changing colors
- chemical additions
- reacting colors
- Firecrackers
- an engine
- heating liquids
- Organic compounds
- chemical changes
Q: Fact 1: All chemical reactions require activation energy to get started. Fact 2: Chemical changes are referred to as a chemical reaction. Given the two facts above, what require activation energy to get started?
Answer: chemical changes

Problem:OPTIONS:
- cacti
- car tire
- Wasps
- sharks
- Insects
- Epidermis
- ligt
- fungi

Fact 1: Invertebrates are animals that lack a vertebral column, or backbone. Fact 2: Insects are the most common invertebrates. Given the two facts above, what animal lacks a backbone?
****
A: Insects

Fact 1: Having no natural predators increases population size. Fact 2: Population size is a function of natality and mortality. Given the two facts above, having what is a cause of mortality?
OPTIONS:
- natural predators
- seasons
- Abnormal cell growth
- liver cancer
- insects
- chickenpox
- influenza
- sunlight
natural predators

Fact 1: Skin is used for protecting the body from harmful substances. Fact 2: Skin is the body's largest organ. Given the two facts above, what can protect the body from harmful substances?
OPTIONS:
- the body's largest organ
- layers of fat
- Electric devices
- bones
- sunburns
- hard outer covering
- deoxyribonucleic acid
- muscle

Answer: the body's largest organ

Question: Fact 1: Recycling has a positive impact on the environment. Fact 2: What's more, paper bags are recyclable themselves. Given the two facts above, what can have a positive impact on the environment?
OPTIONS:
- power stations
- cactuses
- bushes
- power
- mussels
- animals
- paper bags
- satellites
Answer: paper bags

input: OPTIONS:
- airplanes
- adding heat
- trains
- evaporation
- buses
- Metling snow
- car pools
- exercise Now, answer this question: Fact 1: Carpooling decreases the amount of cars used to travel to a place. Fact 2: Arrange carpools to conserve fuel. Given the two facts above, what can reduce fuel usage?
A:
output:
car pools