Scientists are discovering ways to make some crops use less water. A person working in which job would most benefit from this research?
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?
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?
A: respiratory health

Which is true of scientific discoveries?
A:
Sometimes scientific discoveries are made by accident, like the discovery of penicillin.