question:
Which of the following describes an object that must have a net negative charge?

answer:
It contains more electrons than protons.

question:
Scurvy is a disease that sailors often got on long voyages. It was discovered that scurvy could be prevented by eating oranges and lemons. This suggests that scurvy is a disease caused by

answer:
a nutritional deficiency

question:
Which of the following is an example of an assistive device?

answer:
contact lens

question:
Why is a healthy diet important?

answer:
It supplies the body's needs for growth and energy.