Fact 1: Dehydrating food is used for preserving food. Fact 2: Some food is dehydrated, while others are dried much like beef jerky. Given the two facts above, beef jerky is what?

OPTIONS:
- low in protein content
- wet
- prone to spoilage
- nutrients
- barrel-shaped
- Relieve pain
- preserved
- layers of fat

Answer: preserved

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

Answer: kill

Fact 1: Damming a river can cause a lake to form. Fact 2: Beavers build dams. Given the two facts above, what animal can help lakes to form?

OPTIONS:
- mussels
- the trout
- sea urchins
- eukyarotes
- the duck
- The beaver
- amphibians
- the otter

Answer: The beaver

Fact 1: Ethologists usually study how animals behave in their natural environment. Fact 2: Animals behave according to instinct. Given the two facts above, ethologists study how animals use what in their natural environment?

OPTIONS:
- Energy
- Chlorophyll
- fur
- digestion
- instincts
- lungs
- an object
- Energy.

Answer:
instincts