What exactly is your question?
The correct answer is B. It has made tetanus a rare disease in the United States. As with other vaccination programs, Tetanus vaccine has had a high success rate in preventing the disease among vaccinated people. Reinforcing the value of vaccines in preventing serious disease.
Answer:
Direct service - coffee
Indirect service - photosynthesis
Ethical/ Aesthetic pleasure - sightseeing
Answer:
Gel Electrophoresis.
I took the Khan academy test :)
