Substance given to an individual to produce immunity to a disease O vaccine
O microorganism
chain of infection
pathogen

The bones of the extremities are parts of the a-appendicular skeleton b-axial skeleton c-long bone group d-medial skeleton

What kind of wound occurred when the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of skin

Aperson has had a good _ of life if they are still at the age of 95.