Why can't one vaccine work for all diseases or illness?

Accurate and explained answer.

Compare the depth of field when focusing with low power and high power. which power has the greater depth of field?

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.