Q: Fourth graders are planning a roller-skate race. Which surface would be the best for this race?

OPTIONS:
- gravel
- sand
- blacktop
- grass
A: blacktop
Q: Which type of organism is at the lowest level of the food chain?

OPTIONS:
- autotroph
- heterotroph
- carnivore
- omnivore
A: autotroph
Q: The populations of black rhinoceroses have been impacted by human interactions to the point of being endangered. Which interaction best explains why the black rhino is now endangered?

OPTIONS:
- over hunting
- water pollution
- airborne diseases
- increased deforestation
A: over hunting
Q: The orbit of Earth is almost circular and has a period of about 365 days. Compared to the orbit of Earth, which of these objects usually have highly elliptical orbits and can have periods of over 1000 years?

OPTIONS:
- asteroids
- meteorites
- comets
- moons
A:
comets