Which of the following helps the body to cool down? OPTIONS:
- shivering
- sweating
- running a fever
- taking deep breaths
A: sweating

A factory in Japan had been dumping mercury into Minamata Bay. Certain microorganisms in the water were able to change the mercury into a form that the plankton could use. Which most likely happened next? OPTIONS:
- The organisms built up a resistance to the mercury.
- The mercury passed through the food chain.
- The plankton made the mercury safe.
- The fish would not eat the plankton.
A: The mercury passed through the food chain.

Which is the most basic unit of living things? OPTIONS:
- Cells
- Bones
- Tissues
- Organs
A: Cells

Sandra puts some pill bugs into an open box. She covers half the box with a piece of cardboard. She then places the box outside on a summer day, and all the pill bugs move under the cardboard. The pill bugs are most likely responding to which of the following? OPTIONS:
- air pressure
- bright light
- wind
- fog
A:
bright light