Alpha particles cannot penetrate the skin. In which of the following circumstances could they still threaten human health? A. If they travel into the human eye.
B. If they are inhaled or swallowed.
C. If they enter into the human ear.
D. If they are touched.

The air exhaled from the lungs of a smoker has a concentration of 24 ppm co. express the concentration as a percent.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change. when the temperature in a room increases from 25°c to 33°c, changes from a solid to a liquid. in a lab, methane and nitrogen are cooled from -170°c to -200°c. the methane freezes and the nitrogen . when gold is heated to 2,856°c it changes from a liquid to a .

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption