Problem:OPTIONS:
- rocks
- embryos
- pizza
- algae
- energy
- insects
- gills
- food

Fact 1: Phytoplankton are bacteria and algae that use sunlight to make food. Fact 2: Since fish feed on phytoplankton, they are drawn to phytoplankton-rich waters. Given the two facts above, what do fish feed on?
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A: algae

Problem:OPTIONS:
- snakes
- cats
- toxins
- mice
- plants
- HIV
- pesticide
- parasites

Fact 1: Poison causes harm to living things. Fact 2: Most of the snakes that live in swamps are poisonous. Given the two facts above, what causes harm to living things?
****
A: snakes

Problem:OPTIONS:
- cows
- Whales
- humans
- clouds
- Birds
- gravity
- camels
- density

Fact 1: Habitat destruction causes animals to move to find shelter in another habitat. Fact 2: Cows are social animals. Given the two facts above, what moves to find shelter in another habitat because of habitat destruction?
****
A: cows

Problem:OPTIONS:
- heat
- cold
- skin
- nerves
- color
- contact
- smell
- motion

Fact 1: Some touch receptors sense differences in temperature or pain. Fact 2: Heat and temperature are the same. Given the two facts above, some touch receptors sense a difference in pain or what?
****
A:
heat