Are the following statements correct or incorrect?

a) Bacteria are microbes.
correct incorrect

b) All parasites are microbes.
correct incorrect

c) Bacteria can be classified based on their structure and shape.
correct incorrect

d) E. coli is a bacterium.
correct incorrect

e) Viruses are the smallest organisms in the world.
correct incorrect

f) Bacterial infections can be avoided by washing hands.
correct incorrect

g) Viruses are also beneficial for the human body.
correct incorrect

h) There are no vaccines against bacterial diseases.
correct incorrect