Which scientist studied biology by traveling by ship to different islands observing animal life, and developed a hypothesis about how species change? OPTIONS:
- Galileo Galilei
- Albert Einstein
- Charles Darwin
- Sir Isaac Newton
A: Charles Darwin

Cancer is best described as OPTIONS:
- a type of genetic engineering
- the merging of sex cells
- abnormal cell division
- tissue that stops growing
A: abnormal cell division

Which illness is associated with a weakened immune system in the body? OPTIONS:
- tetanus
- cancer
- measles
- rabies
A: cancer

Scientists dig in a dry area at the bottom of a mountain range. Fossilized shells of freshwater mussels are found in the area. Which is a likely conclusion that scientists will draw based on this evidence? OPTIONS:
- Rivers once flowed through the area.
- Volcanoes were once active in the area.
- The ocean shoreline once reached this area.
- Floods were a common occurrence in this area.
A:
Rivers once flowed through the area.