Scientists are discovering ways to make some crops use less water. A person working in which job would most benefit from this research? OPTIONS:
- a farmer
- a doctor
- a waiter
- a cook
A: a farmer

The human body is made up of organ systems that work together as one unit. Which systems work together to prepare and distribute food for cells? OPTIONS:
- digestive and circulatory
- digestive and endocrine
- nervous and respiratory
- nervous and excretory
A: digestive and circulatory

Vehicle exhaust contains a form of pollution called particulate matter. Technologies are being developed to reduce the amount of particulate matter in exhaust. A vehicle that produces less particulate matter would have the greatest impact on which aspect of human health? OPTIONS:
- heart health
- respiratory health
- the rate of birth defects
- weight and physical fitness
A: respiratory health

Which is true of scientific discoveries? OPTIONS:
- All scientific discoveries are based solely on observation and never experimentation.
- Sometimes scientific discoveries are made by accident, like the discovery of penicillin.
- If a scientist cannot provide the exact time and place his or her discovery was made, it is dismissed.
- All scientific discoveries are regulated by government agencies, like the Food and Drug Administration.
A:
Sometimes scientific discoveries are made by accident, like the discovery of penicillin.