Selective breeding has resulted in plants that are resistant to pests and produce a higher yield of fruits and vegetables. Which of these is the most likely disadvantage that can result from this process? OPTIONS:
- decreased genetic diversity
- habitat destruction
- overpopulation
- increased erosion
A: decreased genetic diversity

When you are riding a bicycle at night, your bicycle's reflectors help people in cars see your bicycle. How do bicycle reflectors work? OPTIONS:
- They are made of a special material that gives off its own light.
- They are hooked up to batteries that allow them to produce light.
- They bounce light back from other sources.
- They are covered with paint that glows in the dark.
A: They bounce light back from other sources.

What should a student do when a glass beaker shatters during a laboratory experiment? OPTIONS:
- Notify the teacher.
- Sweep the pieces into a pile.
- Pick up the pieces and throw them away.
- Leave it until the experiment is complete.
A: Notify the teacher.

In any physical or chemical process, what two quantities are always conserved? OPTIONS:
- matter and total energy
- light and acoustic energy
- density and thermal energy
- gravity and potential energy
A:
matter and total energy