*Question*: 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
*Answer*: regulate body functions

*Question*: Which of the following is a cause of the ocean levels periodically rising and then falling? OPTIONS:
- the slight tilt of the Moon
- the force of gravity from the Moon
- the convection within Earth's mantle
- the revolution of Earth around the Sun
*Answer*: the force of gravity from the Moon

*Question*: Which behavior can help animals establish a territory? OPTIONS:
- A caribou herd migrates seasonally.
- A scent trail leads ants to a food source.
- A wolf pack howls to warn other wolves to stay away.
- A honeybee society divides the work between its members.
*Answer*:
A wolf pack howls to warn other wolves to stay away.