The answer is b. the national institutes of health (NIH)
Is their a question to this?
Yes, and you can also catch diseases
Correct answer choice is:
D. Frequency.
Explanation:
AC frequency is the number of periods per moment in an alternating current (ac) sine wave. Said different mode, the frequency is the scale at which the current varies course per instant. It is estimated in hertz (Hz), a global unit of measure wherever 1 hertz is equivalent to 1 cycle per instant.
1. Lymphatic system
5. Lymphocytes
2. Vaccine
3. Inflammation
4. Immune system