Q: Fact 1: Neurons are the structural and functional units of the nervous system. Fact 2: Excitotoxicity kills some neurons. Given the two facts above, excitotoxicity can do what to the structural units of the nervous system?

OPTIONS:
- harm
- loss
- duplicate
- kill
- mutate
- death
- function
- damage

A: kill

Q: Fact 1: Aflower 's purpose is to produce seeds. Fact 2: Grain is the seed portion of the plants. Given the two facts above, what produces grain?

OPTIONS:
- flowers
- leaves
- food
- sugar
- ducks
- plants
- honeybees
- mice

A: flowers

Q: Fact 1: Ethologists usually study how animals behave in their natural environment. Fact 2: Environments reflect native habitats. Given the two facts above, where to ethologists usually study how animals behave?

OPTIONS:
- landscapes
- natural selection
- home
- habitat
- fields
- Summer
- seasons
- zoo

A: habitat

Q: Fact 1: Coal is used to produce electricity by burning in coal-fire power stations. Fact 2: Coal-fired power stations can cause acid rain and contribute to global warming. Given the two facts above, certain types of electricity production can cause acid rain and contribute to:?

OPTIONS:
- global cooling
- global warming
- energy usage
- coal mining
- deforestation
- electrical
- Destroy bridges
- salinity

A:
global warming