Fact 1: Cutting down trees has a negative impact on an ecosystem. Fact 2: Ecosystems are living communities. Given the two facts above, cutting down what has a negative impact on living communities?

OPTIONS:
- bushes
- on calories
- habitat
- manmade structures
- invasive species
- disease
- bamboo
- trees

Answer: trees

Fact 1: Roundworms make up the phylum Nematoda. Fact 2: Also, nematoda and rotifera are important groups contributing to soils. Given the two facts above, what contributes to soils?

OPTIONS:
- roundworms
- humans
- rainfall
- cacti
- bacteria
- weathering
- viruses
- Most plants

Answer: roundworms

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

Fact 1: Cooking food requires adding heat energy. Fact 2: Electrical energy ultimately becomes heat energy. Given the two facts above, what type of energy can be used to cook food?

OPTIONS:
- Light
- metabolism
- sluggish
- fossil fuels
- magnetic
- electrical
- Evaporation
- sunlight

Answer:
electrical