Fact 1: Earthworms are important deposit feeders that help form and enrich soil. Fact 2: Deposit feeders ingest sediment and extract food particles. Given the two facts above, what ingests sediment and extracts food particles?

OPTIONS:
- animals
- soil
- humans
- a fish
- earthworms
- barnacles
- h2o
- bacteria

Answer: earthworms

Fact 1: If an object reflects light toward the eye then that object can be seen. Fact 2: Light is made of photons . Given the two facts above, an object can be seen if it reflects what?

OPTIONS:
- Energy.
- vibrations
- energy
- waves
- sound
- sun's heat
- photons
- sunlight

Answer: photons

Fact 1: If an object in a fluid is more dense than that fluid then that object will sink in that fluid because of gravity. Fact 2: Normally ice floats, because it is less dense than water. Given the two facts above, what happens to ice in water?

OPTIONS:
- it evaporates
- it sinks
- it floats.
- it expands
- they bend
- Condensation
- vaporization
- kinetic energy

Answer: it floats.

Fact 1: Bottleneck effect occurs when a population suddenly gets much smaller. Fact 2: Effects of bottlenecks are unpredictable . Given the two facts above, what is the effect of a population suddenly getting much smaller?

OPTIONS:
- major threat to health
- Decreased precipitation
- a lot of human deaths
- movement of tectonic plates
- it is unpredicatbale
- If they can no longer get food
- Plant growth is reduced
- enormous damage to homes

Answer:
it is unpredicatbale