Q: Populations living in one place form a OPTIONS:
- community
- system
- habitat
- species
A: community

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

regulate body functions

Q: Which of the following properties of a substance is conserved during thermal expansion? ---- OPTIONS:
- mass
- volume
- shape
- distance between particles

A: mass

Sand and iron particles that are similar in size and color are mixed together in a beaker. What would be the best method of separating the particles?
===
OPTIONS:
- Use tweezers to separate them.
- Use a magnet to separate them.
- Add water to the mixture.
- Pour the mixture into a filter.

Use a magnet to separate them.

Question:
Which of the following areas is most likely to form metamorphic rocks such as gneiss and schist?
OPTIONS:
- a sea floor
- a windblown desert
- a site deep underground
- a site covered by a glacier
Answer:
a site deep underground

*Question*: The heart, veins, arteries, and capillaries make up which organ system? OPTIONS:
- reproductive
- muscular
- excretory
- circulatory
*Answer*:
circulatory