Q: Fact 1: Hydropower requires damming a river. Fact 2: Hydropower is a renewable, economical source of electricity. Given the two facts above, what does a renewable, economical source of electricity require?

OPTIONS:
- damming a river
- power stations
- freezing h2o
- electricity
- burning fossil fuels
- hydrogen and oxygen
- sunlight
- nuclear meltdowns

A: damming a river

input: OPTIONS:
- Veins and arteries.
- lack of backbone
- bruised brain stem
- critical organs
- closed circulatory system
- incomplete circulatory system
- characteristics
- sensory neurons Now, answer this question: Fact 1: Chordates have a complete digestive system and a closed circulatory system. Fact 2: Vertebrates are members of of a larger group, the chordates . Given the two facts above, vertebrates have a complete digestive system and a what?
A:
output: closed circulatory system

Fact 1: Viruses cause many human diseases. Fact 2: Another virus is the Human Papilloma virus. Given the two facts above, what causes diseases?

OPTIONS:
- water
- air
- smoking
- fungi
- insects
- Papilloma
- sunlight
- Pollution

Answer: Papilloma

Problem: OPTIONS:
- radiation
- adding heat
- competition
- ice
- bacteria
- air
- carcinogens
- Smoking
Q: Fact 1: Mutations that lead to cancer usually occur in genes that control the cell cycle. Fact 2: Many carcinogens are capable of causing gene mutations. Given the two facts above, what can lead to cancer in genes that control the cell cycle?
Answer: carcinogens

Problem:OPTIONS:
- nucleus of a cell
- some looseness in the soil
- wavelengths and photons
- moss
- single-celled organisms
- organic molecules
- snow
- rocks

Fact 1: The looseness of soil increases the amount of oxygen in that soil. Fact 2: Without oxygen in the soil, most plants die. Given the two facts above, plants may die without what?
****
A: some looseness in the soil

Problem:OPTIONS:
- kinetic energy
- Loud noises
- vibrating waves
- An object is seen
- electromagnetic energy
- deoxyribonucleic acid
- hydrogen and oxygen
- harmful substances

Fact 1: Afirecracker converts chemical energy into sound. Fact 2: Sound waves vibrate. Given the two facts above, a firecracker converts chemical energy into what?
****
A:
vibrating waves