IV. Match the definitions

1. immunology

1. having a limited duration or use

2. ability

2. a liquid extracted from the tissues of an immunized animal used as an antitoxin

3. barrier

3. a structure that prevents passage

4. coexist

4. the mental ability to store past experiences and recall them at will

5. distinguish

5. an unplanned or unexpected meeting

6. encounter

6. the combination of external conditions

7. environment

7. to differentiate between things

8. influence

8. to exist together

9. memory

9. the power to produce effects

10. serum

10. the study of immunity and immune system

11. temporary

11. physical or mental power to perform

1. encounter

succeeding

2. to distinguish

to enclose

3. environment

energetic

4. to encompass

under

5. injurious

countless

6. innumerable

meeting

7. beneath

harmful

8. subsequent

surrounding

9. vigorous

to differentiate

1. major

weak

2. natural

to mix

3. beneath

simplicity

4. to distinguish

previous

5. innumerable

temporary

6. permanent

minor

7. subsequent

single

8. vigorous

above

9. specificity

acquired