Solve these clues to fill the grid.
- Hazard to humans or the environment resulting from biological agents or conditions
- 4 Across
- A mixture of gases required for breathing
- 7 Across
- Hand coverings that keep fingers warm
- 10 Across
- Activity leading to skilled behavior
- 12 Across
- The social force that binds you to the courses of action demanded by that force
- 13 Across
- Infection transmitted by inhalation or ingestion of ___ bacilli and manifested in fever
- 1 Down
- The act of sending a message
- 2 Down
- A covering to disguise or conceal the face
- 3 Down
- Inflammation of the liver caused by a virus or a toxin
- 5 Down
- The virus that causes acquired immune deficiency syndrome
- 6 Down
- Medicines or harmful substances people take
- 8 Down
- Red liquid pumped around the body by the heart
- 9 Down
- A person or firm that ___ workers
- 11 Down