The human brain uses_____ percent of the total oxygen and blood in the body?

✅ D. 80%

✅ A.  20 Hz to 20,000 Hz.

✅ D. Graphite

✅ A. AB

✅ C. Sir Frederick Grant Banting

✅ B. Eugenics

✅ B. pitch

✅ B.  Fibrous joint