Q: Different units of measurement are more useful in some settings than in others. Which unit of measurement is most used when comparing distances within the solar system?

OPTIONS:
- the mile
- the kilometer
- the light year
- the astronomical unit
A: the astronomical unit
Q: Acid rain caused by industrial pollution greatly reduces the number of trees in a forested region that is home to a particular species of bird. How might this decrease in the number of trees most likely affect this bird population?

OPTIONS:
- The population will adapt to ground dwelling.
- The population will decrease due to lack of resources.
- The population will stabilize when it moves to another region.
- The population will increase as predators move out of the region.
A: The population will decrease due to lack of resources.
Q: According to Darwin's theory of evolution, the variations among finches that he observed in the Galapagos Islands resulted from

OPTIONS:
- transmission of acquired characteristics.
- use or disuse of their beaks.
- natural mutagens.
- natural selection.
A: natural selection.
Q: The main function of hormones in the human body is to

OPTIONS:
- identify and destroy microbes
- regulate body functions
- transport blood to cells
- store energy
A:
regulate body functions