The first line of defense for keeping pathogens out of the body is the
a. skin
b. antibodies
c. immune system
d. white blood cells

Which of the following must be treated under the care of a physician and is mainly considered a medical condition? a. scoliosis b. lordosis c. kyphosis d. all of the above

Which situational condition decreases the chances of crimes?

Viral infections in plants ) can be controlled with antibioticsb) can spread within a plant via plasmodesmata c) have little effect on plant growthd) are not spread by animals