*Question*: A crop of corn plants is genetically modified so that the plants produce a natural pesticide. People are concerned that these corn plants might transfer modified genetic material to other plants. Which of the following is the best way to further modify the plants to prevent them from transferring their genetic materials to other plants? OPTIONS:
- changing the plants so they do not make pollen
- changing the plants so they do not harm insects
- changing the plants so they cannot produce nutrients
- changing the plants so they cannot be easily identified
*Answer*: changing the plants so they do not make pollen

*Question*: Populations living in one place form a OPTIONS:
- community
- system
- habitat
- species
*Answer*: community

*Question*: Comparing the skeletons of which of the following fish would best show the evolution of a fish species? OPTIONS:
- a male fish and a female fish that could produce offspring
- the same fish just before it received a cut and after it healed
- a fish that lived recently and a fish that lived a long time ago
- the same fish just after it hatched and when it was full-grown
*Answer*:
a fish that lived recently and a fish that lived a long time ago